The speeds of 3 trains in the ratio 10:15:20. The ratio between time taken by them to travel the same distance is? Choose the correct choice from the following answers:
A) 6:4:3
B) 1:2:3
C) 4:8:9
D) 6:5:2
E) 4:8:7
Ratio of time taken is = 1/10 : 1/15 : 1/20 = 6:4:3   6:4:3nswer is 6:4:3
<result>A</result>
The speeds of 3 trains in the ratio 10:15:20. The ratio between time taken by them to travel the same distance is?