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