Question

A man standing on a railway platform noticed that a train took $21$ seconds to cross the platform (this means the time elapsed from the moment the engine enters the platform till the last compartment leaves the platform) which is $88$ meters long, and that it took $9$ seconds to pass him. Assuming that the train was moving with the uniform speed, what is the length of the train in metres?

• A. $5$
• B. $60$
• C. $66$
• D. $72$

Answer 1

The correct option is A $5$

$9v+88=21v$
$12v=88$
$V=\frac{88}{12}$
Required $=9V=9\times \frac{88}{12}=66$