Two trains are moving in the same direction at speed of 54 km/h and 92 km/h, their lengths are 400 m and 360 m respectively. What is the time taken (in seconds) by faster train to cross the slower train?
Relative speed of trains (moving in same direction) = $$92-54=38$$ km/hr
= $$(38\times\frac{5}{18})$$ m/s = $$\frac{95}{9}$$ m/s
Total lengths = $$400+360=760$$ m
Thus, time taken = $$\frac{760}{\frac{95}{9}}$$
= $$760\times\frac{9}{95}=72$$ seconds
=> Ans - (B)
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