Question

A train with speed of 72 kmph crosses a pole in 30 seconds then find the time taken by the same train to cross the pole with 54 kmph​

Answer 1

Answer:

kuchh bhi likh do Broo pass ho jaoge

Answer 2

Step-by-step explanation:

Train travels 72 x 5/18 x 23 = 460 m in 23 sec.

Length of platform is 120m.

=> Length of train =460 - 120 = 340m.

It crosses a pole in 340 x 18/(72 x 5) = 17 seconds

Alternatively :

Speed of train = 72 x 5/18 = 20 m/s

It will take 120/20 = 6 seconds to cover length of platform.

=> Remaining 17 seconds to cover length of train.

:-)