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 direction on parallel tracks. The
time (in seconds) which they take to cross
each other is:
(A) 9 s
B 6​

Answer 1

Answer:

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Step-by-step explanation:

Relative speed = (60 + 40) km/hr = 100 x 5 m/sec = 250 m/sec.

18 9

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time = 300 x 9/250 sec = 54/5 sec = 10.8 sec.