Question

How much longer does it take a automoblie to travel one mile at 20 miles per hour than at 30 miles per hour? show your work.

a. 1 minute
b. 10 minutes
c. 20 minutes
d. none of these answers.

Answer 1

A

Explanation:

At the rate of 20 miles per hour, the car will travel 20 miles every 60 minutes, or a third of a mile every minute. This means that it will travel a mile in 3 minutes. For the car travelling at 30 miles per hour, it will travel half a mile every minute, or a mile every 2 minutes. 3-2=1 minute, or choice A. Hope this helps!