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### Discussion :: Problems on Trains

1. Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?

2.  A. 23 m B. 2  $${{2} \over 9}$$ m C. 27 m D. 29 m

Answer : Option C

Explanation :

Relative speed =(40-20) km/hr = $$(20\times\frac{5}{18})m/sec =( \frac{50}{9}) m/sec$$

Length of faster train = $$(\frac{50}{9}\times5)m =(\frac{250}{9})m =27 (\frac{7}{9})m$$

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