Question
Two trains P and Q of lengths 320 m and 540 m,
respectively, are running in the same direction on parallel tracks at 108 km/h and 144 km/h, respectively. How much time will the trains take to cross each other completely?Solution
Length of train P =320m and train Q=540m. Total distance =540+320=860m Speed of trains P and Q =108 km/h and 144 km/h. Speed of trains when are running in same direction=144-108=36km/h =36×5/18=10m/sec. Now time =860/10 =86sec. =86sec.
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