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If a train ...

Question

If a train $110$ m long passes a telegraph pole in $3$ seconds, then the time taken (in seconds) by it to cross a railway platform $165$ m long, is

A

3

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B

4

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C

5

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D

7.5

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Solution

The correct option is D $7.5$
$s p e e d = \frac{110}{3} = 36.7 m / s$
$t o t a l l e n g t h = 110 + 165 = 275 m$
$t i m e = \frac{t o t a l l e n g t h}{s p e e d} = \frac{275}{36.7} = 7.5 s$

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