Question

if a train cross a point in 27/2 sec, moving with a speed of 30km/h, length of the train is?

Answer 1

2371m .......,...,,,,,,,,,,,

Answer 2

speed = distance traveled
                  Time taken 
30*$\frac{5}{18}$ =  distance traveled
                                                       13.5
Distance traveled = 112.5 m
To cross a point, the train has to travel its entire length, which is the distance traveled here.
So, length of the train = 112.5m