Q: The distance between two cities is ninety miles, and a woman drives from one city to the other at a rate of 45 mph. At what rate must she return if the total travel time is three hours and forty

minutes?
27 mph
45 mph
54 mph

A: 1st leg DATA:
distance = 90 mi ; rate = 45 mph ; time = d/r = 2 hrs.
- -
2nd leg DATA:
distance = 90 mi ; time = [3 2/3 - 2] = 1 2/3 hrs; rate = 90/(5/3) = 54 mph
- - - -
Ans: 54 mph
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Cheers,
Stan H.

manimic|Points 140|

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Asked 8/9/2013 3:06:58 PM

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