Question

Two trains 200 m and 150 m long are running parallel rails at the rate of 40 kmph and 45 kmph respectively. In how much time train cross each other, If they are running in the direction?

• A. 72 sec
• B. 132 sec
• C. 192 sec
• D. 252 sec

Answer 1

The correct option is D 252 sec

$\text{Relative speed = (45-40)kmph = 5~kmph.}=(5\times \frac{5}{18})sec.=252sec.\text{Total distance covered = Sum of length of trains= 350 ~m}\therefore \text{time taken}=(350\times \frac{18}{25})sec.=252sec.$