First slide

Rectilinear Motion

Question

A 150m long train is moving with a uniform velocity of 45km/h. The time taken by the train to cross a bridge of length 850m is

Moderate

A

56 sec
B

68 sec
C

80 sec
D

93 sec

Solution

$t i m e t a k e n = \frac{t o t a l l e n g t h o f t r a i n a n d b r i d g e}{v e l o c i t y o f t r a i n}$
$v e l o c i t y o f t r a i n = 45 \times \frac{5}{18} m / s e c (c o n v e r s i o n) t i m e t a k e n = \frac{150 + 850}{45 \times \frac{5}{18}} = 80 \sec$

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