Question

In what time will a railway train 60 m long moving at the rate of 36 kmph pass a telegraph post on its way?

Answer 1

Answer: 6 seconds

Step-by-step explanation:

Train length = 60 m = Distance

Train speed = 36 km/hr = 36*5/18 m/sec =  10 m/sec

Time to cross telegraph post = Distance/Speed

                                                = 60/10 = 6 seconds

Answer 2

Given:

length of train = 60m

Speed of the train = 36 km/hr

To Find:

  Time taken by the train to pass a telegraph post on its way

Solution:

Formula to find Time is given by,

  Time = $\frac{Distance}{Speed}$

In the given data the speed of the train is given in km\hr , In order to find time we convert the speed of train to m/sec by multiplying it with $\frac{5}{18}$m/sec

1 kilometer = 1000 m & 1 hour = 3600 sec

now km\hr can also be written as 1000/3600 .On simplifying  1000/3600 further ,we get 5/18.

Train Speed = 36×5/18 m/sec

Train speed  = 10 m/sec

Time to cross the telegraph post = Distance/speed

Time to cross the telegraph post  = $\frac{60 m}{10 m/sec}$

Time to cross the telegraph post    = 6 seconds

Time taken by the train to pass a telegraph post on its way is 6 seconds