A train running at the speed of 20 m/s crosses a pole in 24 sec less than the time it requires to cross a platform thrice its length at the same speed. What is the length of the train?  Select the correct option
A) 150 m  B) 200 m  C) 180 m  D) 160 m  E) 170 m
Let the length of the train be x m.   So, the length of the platform = 3x m.   Time taken in crossing the platform = 4x/20sec   Time taken in crossing the pole = x/20 sec   â‡’x/20+24=4x/20   x = 160 m   Answer : 160 m
<result>D</result>
A train running at the speed of 20 m/s crosses a pole in 24 sec less than the time it requires to cross a platform thrice its length at the same speed. What is the length of the train?