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Question
Two trains 105 meters and 90 meters long, run at the speeds of 45 km/h and 72 km/h respectively , in opposite directions on parallel tracks. The time which they take to cross each other , is :
8 seconds
7 seconds
5 seconds
6 seconds
ANSWER : 4
Descrption
Length of the 1st train = 105 m <br/> Length of the 2nd train = 90 m <br/> Relative speed of the trains, <br/> = 45 + 72 = 117 kmph <br/> = (117 × 5)/18 <br/> = 32.5 m/sec <br/> Time taken to cross each other, <br/> = (Length of 1st train + length of 2nd train)/ relative speed of the trains <br/> ∴ Time taken = 195/32.5 <br/> = 6 secs.
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