A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from the opposite directions in 6 seconds. The speed of the second train is

48

km/hr

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54

km/hr

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66

km/hr

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82

km/hr

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Solution

The correct option is D $82$ km/hr
Distance travelled $= 108 + 112 = 220$

$d i s t a n c e = s p e e d \times t i m e$

If speed of second train is x, then $\Rightarrow \frac{220}{(50 + x) \times \frac{5}{18}} = 6$
$∴ 50 + x = 132$

$\Rightarrow x = 82$

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