Question

Two trains are running at 40 kmph and 20 kmph respectively in the same direction. Faster train completely passes a man sitting in the slower train in 5 seconds. What is the length of the faster train?

• A. 23 m
• B. 209/9 m
• C. 27 m
• D. 250/9 m
• E. 28 m

Answer 1

The correct option is D

250/9 m

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

Length of faster train = $\left(\frac{50}{9}\times 5\right)m=\frac{250}{9}m=27\frac{7}{9}m.$