Ace the ASVAB

Question of the day:
Ms. Lewis plans to drive 900 miles to her vacation destination, driving an average of 50 miles per hour. How many miles per hour faster must she average, while driving, to reduce her total driving time by three hours?

Before looking at the answer, try to do it yourself.

First we must know how many hours it originally took Mr. Lewis. 900 miles/50 mph = 18 hours. The question wants us to figure out how fast he has to drive to go 900 miles in 15 hours of driving time, right? Because 15 is three less than 18. 900/15 = 60 mph so Ms. Lewis must drive 10 mph faster to reduce her total driving time by three hours.

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