Question 22

Two trains of equal length are running on parallel lines in the same direction at 54km/hour and 40km/hour. The slower train started first and then the faster train started after some time. The faster train passes the length of the slower train in 36 seconds completely. The length of each train is?

Solution

Let the length of both trains be $$'x'$$.

The speeds of trains are 54Kmph & 40Kmph.

The faster train passes the length of the slower train in 36 seconds.

It implies, $$\frac{x+x}{54-40}=\frac{36}{60\times\ 60}$$

$$\frac{2x}{14}=\frac{36}{60\times\ 60}$$

$$x=0.07\ Km$$

$$x=70\ m$$.

Hence, Option (B) is correct.

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