Question 127

A train 150 metres long crosses a milestone in 15 seconds and crosses another train of the same length travelling in the opposite direction in 12 seconds. The speed of the second train in km/hr is

Solution

1st train crosses milestone in 15 seconds.

=> Speed of 1st train = $$\frac{150}{15}$$ = 10 m/s

Length of 2nd train = 150 m

Let speed of 2nd train = $$x$$ m/s

Acc to ques :

=> $$\frac{150 + 150}{x + 10} = 12$$

=> $$x + 10 = 25$$

=> $$x = 25 - 10 = 15$$ m/s

=> Speed of 2nd train = $$15 * \frac{18}{5}$$ km/h

= 54 km/h

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