Two trains of length 110 m and 90 m are running on parallel lines in the same direction with a speed of 45 km/h and 50 km/h respectively. In what time will they pass the other?

136 s

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138 s

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142 s

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146 s

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None of these

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Solution

The correct option is E None of these
Reltative speed = (50 - 45) km/h = 5 km/hr
$\Rightarrow 5 \times \frac{5}{18} m / s = \frac{25}{18} m / s e c$
According to question,
$\frac{25}{18} = \frac{110 + 90}{t}$
$\Rightarrow t = \frac{200 \times 18}{25} = 144 s$

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