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Bunuel
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fahdman
Bunuel,
can you postyour explanation? I did not understand the first answer.

Best.
­Sarah is traveling from City A to City B. The distance between these two cities is 185 miles, and she planned to arrive at City B in 2 hours and 30 minutes. Her average speed for the first 1 hour and 40 minutes was 75 miles per hour, but then she realized that she should slow down to drive more safely. If she still wanted to arrive at her destination on time, at what speed should she drive?

A) 60.0 miles per hour
B) 64.0 miles per hour
C) 68.0 miles per hour
D) 70.5 miles per hour
E) 72.0 miles per hour

Sarah wants to cover 185 miles in 2 hours and 30 minutes, so in 5/2 hours.

In 1 hour and 40 minutes, or 5/3 hours, at 75 miles per hour, Sarah would have covered 5/3 * 75 = 125 miles. To cover the remaining 185 - 125 = 60 miles, in exactly 5/2 hours - 5/3 hours = 5/6 hours, she must average 60/(5/6) = 72 miles per hour.

Answer: E.­
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