Question

A train 125 m long crosses an equally long train at rest in 10 s. What is the speed of the train in kmph?

• A. 90

Answer 1

The correct option is A 90

Given,
Length of the train = 125 m
Time taken to cross = 10 s

Distance covered by the train to cross the train=
$2\times 125=250\text{m}$
[Both the trains are of equal length]

$\text{Speed}=\frac{\text{Distance}}{\text{Time}}=\frac{250}{10}=25\text{m/s}1\text{m/s}=\frac{18}{5}\text{km/hr}25\text{m/s}=25\times \frac{18}{5}\text{km/hr}=90\text{kmph}$

$\text{So, the required speed}=90\text{km/h}$