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Question:
How many seconds longer does it take to drive 1 mile at 40 miles per hour than at 60 miles per hour?

Option A):
15
Option B):
40
Option C):
90
Option D):
60
Option E):
30

Correct Answer is Option E):
30

Explanation:
Solution:
Since d = rt , t =d/r. The time required to drive 1 mile at 40 miles per hour is:
t = 1 mile/40 miles per hour  = 1/40 hour = (1/40) (60) minutes = 1.5
minutes = (1.5) (60) seconds = 90 seconds
The time required to drive 1 mile at 60 miles per hour is :
t = 1 mile/60 miles per hour = 1/60 hour = (1/60) (60) minutes = 1 minutes = 60 seconds
So it takes 90 - 60 = 30 seconds more to drive 1 mile at 40 miles per hour than at 60 miles per hour.