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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 uniform speed, what is the length of the train in metres?
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The correct answer is:
66
$9 \mathrm{v}+88=21 \mathrm{v}$
$12 \mathrm{v}=88$
$\mathrm{~V}=\frac{88}{12}$
Required $=9 \mathrm{~V}=9 \times \frac{88}{12}=66$
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