how many seconds will a train 60m in length , travelling at the rate of 42 km an hour, take in passing another train 84m long, proceeding in the same direction at the rate of 30km an hour?
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since they are traveling in same direction so effective speed=42-30=12 km/hr = 12*5/18 m/sec=10/3 met/sec
distance to cover= its own length+ length of other train=60+84=144meter
So now time= distance/speed= 144/(10/3)=14.4*3 sec= 43.2 sec
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