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What is the correct answer?

4

Two trains 140 metre and 160 metre long run at the speed of 60 km/hr and 40 km/hr respectively in opposite direction on parallel tracks. What time these will take to cross each other ?

A. 10.7 Seconds

B. 10.8 Seconds

C. 10.9 Seconds

D. 11.8 Seconds

Correct Answer :

B. 10.8 Seconds


Relative Speed = 60+40 = 100 Kmph
= 100*(5/18) = 250/9 m/sec
Distance to be covered = 140 + 160 = 300 metres
Time = Distance/Speed
Time=300×9250=545=10.8 Seconds
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