Wind is blowing west to east along two parallel tracks. Two train moving with the same speed in opposite directions on these tracks have the steam tracks. If one is double than the other, what is the speed of each train ?

Options

A. equal to that of wind
B. double that of wind
C. three times that of wind
D. half that of wind

Answer

C

Explanation

Let (u) and (v) be the speed of train and wind respectively. The speed of steam track of train moving in the direction of wind ` = u-v`
The speed of steamtrack of train moving in the oppsite direction of wind ` =u +v`.
As per question, (u+v) = 2 (u-v) ` or u= 3 v`.