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 Tom's average speed to Peter's average speed?  Pick one.
A) 1:5  B) 2:5  C) 1:2  D) 3:2  E) 2:3
The answer is suppose to be D. 3:2. It's from the GMATPrep   option 3:2 is answer
<result>D</result>
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 Tom's average speed to Peter's average speed?