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If a car traveled from Townsend to Smallville at an average [#permalink]
20 Jul 2008, 09:35
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If a car traveled from Townsend to Smallville at an average speed of 40 mph and then returned to Townsend later that evening, what was the average speed for the entire trip? (1) The return trip took 50% longer than the trip there.
(2) The distance from Townsend to Smallville is 165 miles.
When you are given the rate, you can make up the distance (any smart number, 80 would work in this case) and then solve for the time on the first trip. Then, with this data, setup the formula for the return trip and use the information given in Stat. 1.
Stat. 2 is clearly insufficient because it doesn't even mention the return trip.
Use this method also to solve PS questions were you are only given the rate.