问题描述：
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
(A) 1 :5
(B) 2 :5
(C) 1 :2
(D) 3 :5
(E) 2 :3
问题解答：
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