Question

a train running at a speed of 54km hr, passes an electric pole in11 sec. how long a platform 240m long?​

Answer 1

Answer:

27 seconds

Step-by-step explanation:

First, convert km/h to m/s by multiplying 54 by 5/18.

=> (5/18)*54 = 5*3 => 15 m/s

Acc. to ques, it took the train 11 seconds to cross electric pole.

Thus, the length of the train is 15*11 => 165 m

Now, it has to cross a platform of length 240 m.

So, total displacement = 240 + 165 => 405 m

As, Time = (Distance/displacement)/(Speed)

=> 405/15 => 27 seconds

Thus, it will take the train 27 seconds to cross a 240 m long platform.