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- Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks.
Question 1:
Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is: A. 9
B. 9.6
C. 10
D. 10.8
Feedback Relative speed = (60 + 40) km/hr =(100 * 5/18) m/sec = (250/9) m/sec.
Distance covered in crossing each other = (140 + 160) m = 300 m.
Required time = 300 * 9/250 sec = 54/5 sec = 10.8 sec
Distance covered in crossing each other = (140 + 160) m = 300 m.
Required time = 300 * 9/250 sec = 54/5 sec = 10.8 sec
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