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 ?
the answer is suppose to be d . 3 : 2 . it ' s from the gmatprep option d is answer
divide(subtract(const_1, divide(2, 5)), divide(2, 5))