The speeds of 3 trains in the ratio 2:4:6. The ratio between time taken by them to travel the same distance is? Choose the correct choice from the following.
A) 6:4:3 B) 1:2:3 C) 4:8:9 D) 6:3:2 E) 4:8:7
Ratio of time taken is = 1/2 : 1/4 : 1/6 = 6:3:2   Answer is 6:3:2
<result>D</result>
The speeds of 3 trains in the ratio 2:4:6. The ratio between time taken by them to travel the same distance is?