Worksheet for calculating elapsed time using analog clocks.

Let's solve each row step by step. We are given two clocks in each row — the first shows the starting time, and the second shows the ending time. We need to:

1. Read the time on each clock.
2. Determine how many hours have passed between the two times.

---

Row 1:

- First clock: The hour hand is pointing at 1, minute hand at 12 → 1:00 AM
- Second clock: The hour hand is pointing at 6, minute hand at 12 → 6:00 AM

> Hours passed = 6:00 AM - 1:00 AM = 5 hours

✔ Answer:
1:00 AM, 6:00 AM, 5 : 00

---

Row 2:

- First clock: Hour hand at 3, minute hand at 12 → 3:00 AM
- Second clock: Hour hand at 10, minute hand at 12 → 10:00 AM

> Hours passed = 10:00 AM - 3:00 AM = 7 hours

✔ Answer:
3:00 AM, 10:00 AM, 7 : 00

---

Row 3:

- First clock: Hour hand at 10, minute hand at 12 → 10:00 PM
- Second clock: Hour hand at 4, minute hand at 12 → 4:00 PM

Wait! This is tricky. The second clock shows 4:00 PM, but the first was 10:00 PM — that would mean it’s going backwards in time unless we consider a next day.

But since both are labeled PM, let's check:
- From 10:00 PM to 4:00 PM (next day) — this crosses midnight.

So:
- From 10:00 PM to 12:00 AM = 2 hours
- From 12:00 AM to 4:00 PM = 16 hours
- Total = 2 + 16 = 18 hours

But wait — the second clock is 4:00 PM, which is before 10:00 PM in the same day, so it can't be after.

This suggests an error in interpretation.

Wait — look again:
- First clock: 10:00 PM
- Second clock: 4:00 PM

But if it's same day, then 4:00 PM comes before 10:00 PM, so time cannot pass from 10 PM to 4 PM on the same day.

Therefore, the second clock must be 4:00 PM the next day?

But the label says PM for both.

So perhaps the second clock is 4:00 PM, and the first is 10:00 PM, so time went backward? That doesn’t make sense.

Wait — maybe I misread the clock.

Let me double-check the third row:

- First clock: Hour hand at 10, minute at 12 → 10:00 PM
- Second clock: Hour hand at 4, minute at 12 → 4:00 PM

But 4:00 PM is earlier than 10:00 PM — so this can't be "hours passed" unless it's the next day.

But 4:00 PM is not later than 10:00 PM.

So unless the second clock is 4:00 AM, but it's labeled PM.

Wait — no, the second clock has the hour hand pointing at 4, and the minute hand at 12, so 4:00 PM.

But 10:00 PM to 4:00 PM is not forward.

Unless... the labels are wrong?

Wait — perhaps the first clock is 10:00 PM, and the second clock is 4:00 PM the next day?

That would be 18 hours later.

But 4:00 PM is not after 10:00 PM — it’s earlier.

Wait — maybe the second clock is actually 4:00 AM?

No — the hour hand is at 4, and the clock face shows PM, so it's 4:00 PM.

But that doesn’t make sense.

Wait — maybe the first clock is 10:00 PM, and the second clock is 4:00 PM — but time passed would be negative?

That can't be.

Wait — perhaps I'm reading the clocks wrong.

Let me recheck the third row:

- First clock: Hour hand at 10, minute at 12 → 10:00 PM
- Second clock: Hour hand at 4, minute at 12 → 4:00 PM

But 4:00 PM is before 10:00 PM.

So unless it's 4:00 PM the next day, then:

From 10:00 PM to 12:00 AM = 2 hours
From 12:00 AM to 4:00 PM = 16 hours
Total = 18 hours

But 4:00 PM is 18 hours after 10:00 PM?

Wait — no!

Let’s do it properly:

- 10:00 PM to 12:00 AM = 2 hours
- 12:00 AM to 4:00 PM = 16 hours
- So total from 10:00 PM to 4:00 PM (next day) = 18 hours

Yes, that’s correct.

So even though 4:00 PM is earlier in the day, it’s the next day, so 18 hours have passed.

✔ So answer:
10:00 PM, 4:00 PM, 18 : 00

But wait — is that logical? Let’s test:

- Start: 10:00 PM
- After 2 hours: 12:00 AM (midnight)
- After 16 more hours: 4:00 PM

Yes, total 18 hours.

So 18 hours have passed.

---

Row 4:

- First clock: Hour hand at 9, minute at 12 → 9:00 PM
- Second clock: Hour hand at 5, minute at 12 → 5:00 PM

Again, 5:00 PM is before 9:00 PM — so again, likely next day.

So from 9:00 PM to 5:00 PM (next day):

- 9:00 PM to 12:00 AM = 3 hours
- 12:00 AM to 5:00 PM = 17 hours
- Total = 20 hours

✔ So answer:
9:00 PM, 5:00 PM, 20 : 00

Wait — let’s verify:

- 9:00 PM to 12:00 AM = 3 hours
- 12:00 AM to 5:00 PM = 17 hours
- Total = 20 hours → yes.

But is 5:00 PM really 20 hours after 9:00 PM?

Let’s count:

- 9:00 PM → 12:00 AM = 3 hours
- 12:00 AM → 12:00 PM = 12 hours
- 12:00 PM → 5:00 PM = 5 hours
- Total = 3 + 12 + 5 = 20 hours

Yes.

---

But now I notice something: In rows 3 and 4, the hour hands might be misread.

Let’s go back and double-check all clocks carefully.

---

Re-examining Row 3:

- First clock: Hour hand at 10, minute at 12 → 10:00 PM
- Second clock: Hour hand at 4, minute at 12 → 4:00 PM

But if 4:00 PM is after 10:00 PM, it must be the next day.

So time passed = 18 hours.

✔ 10:00 PM → 4:00 PM (next day) = 18 hours

---

Row 4:

- First clock: Hour hand at 9, minute at 12 → 9:00 PM
- Second clock: Hour hand at 5, minute at 12 → 5:00 PM

Same issue: 5:00 PM is before 9:00 PM.

So 5:00 PM next day = ?

- 9:00 PM to 12:00 AM = 3 hours
- 12:00 AM to 5:00 PM = 17 hours
- Total = 20 hours

✔ Yes.

---

But wait — is there a possibility that the second clock in row 4 is 5:00 AM instead of PM?

No — the label says PM, and the hour hand is at 5, so it's 5:00 PM.

So yes, next day.

---

But let’s check if the clocks show AM/PM correctly.

In row 3, the first clock is 10:00 PM, second is 4:00 PM — but 4:00 PM is earlier than 10:00 PM.

So unless the second clock is 4:00 AM, but it's labeled PM.

Wait — maybe I misread the hour hand.

Let’s look closely.

Wait — in row 3, the second clock: hour hand is at 4, minute at 12 → 4:00 PM

But from 10:00 PM to 4:00 PM is 18 hours later only if it's the next day.

Similarly, 9:00 PM to 5:00 PM next day is 20 hours.

But let’s see if there’s another interpretation.

Wait — could the second clock in row 3 be 4:00 AM?

No — the label says PM, so it's 4:00 PM.

But that would mean the time goes backward — which is impossible.

So the only logical explanation is that the second clock is the next day.

Thus, the answers are:

---

Final Answers:

#### Row 1:
- 1:00 AM → 6:00 AM → 5 hours
- ✔ 1:00 AM, 6:00 AM, 5 : 00

#### Row 2:
- 3:00 AM → 10:00 AM → 7 hours
- ✔ 3:00 AM, 10:00 AM, 7 : 00

#### Row 3:
- 10:00 PM → 4:00 PM (next day) → 18 hours
- ✔ 10:00 PM, 4:00 PM, 18 : 00

#### Row 4:
- 9:00 PM → 5:00 PM (next day) → 20 hours
- ✔ 9:00 PM, 5:00 PM, 20 : 00

---

✔ Final Answer:

```
1:00 AM 6:00 AM 5 : 00
3:00 AM 10:00 AM 7 : 00
10:00 PM 4:00 PM 18 : 00
9:00 PM 5:00 PM 20 : 00
```

Note: For rows 3 and 4, the ending time is on the next day, so the elapsed time spans midnight.