Discussion Forum



1)

A goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 26 seconds. What is the length of the goods train ?


A) 230 m

B) 240 m

C) 260 m

D) 270 m

E) 280 m

Answer:

Option D

Explanation:

Speed $=\left(72\times\frac{5}{18}\right)$ m/sec $=20$ m/sec; Time $=26$ sec.

Let the length of the train be $x$ metres.

Then, $\frac{x+250}{26}$ $=20$

$\Leftrightarrow x+250$ $=520$ $\Leftrightarrow x=270$.