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Q.

A train is running at a speed of 84km/hr crosses an electric pole in 9 sec. The length of the train is

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a

70 m

b

210 m

c

630 m

d

126 m

answer is C.

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Detailed Solution

Speed $= 84 km/hr = 84 \times \frac{5}{18} m/sec, Time = 9 \sec$

Length of train $= speed \times Time$

$= \frac{28 \times 5}{6} \times 9 = 210 m$

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