Gmat_mission wrote:Peter and Tom shared the driving on a certain trip. If Peter and Tom both drove for the same amount of time, but Peter only drove 2/5 of the total distance, what was the ratio of Peter's average speed to Tom's average speed?
A. 1:5
B. 2:5
C. 1:2
D. 3:5
E. 2:3
Let the total distance = 5 miles and the time for each driver = 1 hour.
Since Peter drives 2/5 of the total distance -- 2 miles -- in 1 hour, Peter's speed = d/t = 2/1 = 2 miles per hour.
Since Tom drives the remaining distance -- 3 miles -- in 1 hour, Tom's speed = d/t = 3/1 = 3 miles per hour.
Resulting ratio:
(Peter's speed) : (Tom's speed) = 2:3.
The correct answer is
E.
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