Two trains are running in opposite directions with the same speed. If the length of each train is 135 metres and they cross each other in 18 seconds, the speed of each train is

29 km/hr

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35 km/hr

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27 km/hr

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None of these

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Solution

The correct option is C 27 km/hr
(c)
Let the speed of each train be xm/sec
We have, $L_{1} = L_{2} = 135 m$
$S_{1} = S_{2} = x m / sec$

$\frac{L_{1} + L_{2}}{s_{1} + s_{2}}$

$\Rightarrow 18 = \frac{135 + 135}{x + x}$

$o r, x = \frac{270}{2 \times 18} m / s$

$= \frac{270}{2 \times 18} \times \frac{18}{5} k m / h r = 27 k m / h r$

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