Question 52

Two trains, one 150 m long and the other 130 m long, coming from opposite directions
crossed each other in 7.2 seconds. The sum of speed of the two trains every hour would then be:

Solution

The correct option is D.

Since two trains are coming from opposite direction so relative speed is sum of the speed of trains.

So time taken to cross each other = $$\frac{sum of length of trains }{sum of speed of trains}$$

$$\Rightarrow$$ 7.2sec =$$\frac{130+150}{sum of speed}$$

$$\Rightarrow$$ $$sum of speed$$ = $$280\times7.5 m/s$$ = 140km/h

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Two trains, one 150 m long and the other 130 m long, coming from opposite directionscrossed each other in 7.2 seconds. The sum of speed of the two trains every hour would then be: