Renu was sitting inside train A, which was travelling at 50 km/h. Another train, B, whose length was two times the length of A crosses in the opposite direction in 15 seconds. If the speed of train B was 58 km/h, then the length of train A (in m) is:
Relative speed in opposite direction = 50 + 58 = 108 km/hr = 108 $$\times \frac{5}{18}$$ = 30 m/sec
Time =15 sec
Let the length of train A be l
So, length of train B = 3l
Length = speed $$\times$$ time
l +Â 2l = 30Â $$\times$$ 15
3l = 450
l = 150 m
So, the length of train A (in m) is 150 m.
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