Answer:
It will take Mei 32 minutes to finish 20 laps
Explanation:
* Lets explain how to solve the problem
- Mei is competing in a remote-control car race
- She can complete 15 laps in 24 minutes
- We need to find how long she will take to finish 20 laps if she keeps
the same speed
∵ Mei can complete 15 laps in 24 minutes
- Lets find her unit rate
∵ Her unit rate = number of laps ÷ the time of this laps
∴ Her unit rate = 15 ÷ 24 = 0.625 lap per minute
- Now we can use her unit rate to find the time of any numbers of laps
∵ She keeps her rate
∵ She will finish 20 laps
∵ Time = number of laps ÷ her rate
∴ Time = 20 ÷ 0.625
∴ Time = 32 minutes
* It will take Mei 32 minutes to finish 20 laps