Question: 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?
[A].23 m
29 m
[A].
[B].
| 23 | 2 | m |
| 9 |
[C].
| 27 | 7 | m |
| 9 |
[D].
Answer: Option C
Explanation:
| Relative speed = (40 – 20) km/hr = | 20 x | 5 | m/sec = | 50 | m/sec. | ||||
| 18 | 9 |
| Length of faster train = | 50 | x 5 | m = | 250 | m = 27 | 7 | m. | ||
| 9 | 9 | 9 |