1. To find how long it will take to write 60 emails at a rate of 12 emails per day, divide the total number of emails by the rate:
60 emails ÷ 12 emails/day = 5 days
2. First, find Peter's speed: 10 kilometers ÷ 2 hours = 5 kilometers per hour. Then, divide the distance by the speed to find the time:
30 kilometers ÷ 5 kilometers/hour = 6 hours
3. First, find the time to wash one car: 20 minutes. Then, multiply by the number of cars:
20 minutes/car × 20 cars = 400 minutes
4. To find the time to write a 500-word essay at a rate of 4 words per minute, divide the total words by the rate:
500 words ÷ 4 words/minute = 125 minutes
5. To find how long it takes to bake 400 cakes at a rate of 20 cakes per hour, divide the total cakes by the rate:
400 cakes ÷ 20 cakes/hour = 20 hours
6. First, find the time per lap: 10 minutes ÷ 2 laps = 5 minutes per lap. Then, multiply by the number of laps:
5 minutes/lap × 5 laps = 25 minutes
Parent Tip: Review the logic above to help your child master the concept of rate and unit rate worksheet.
