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:
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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