Question: A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
[A].40 sec
42 sec
45 sec
48 sec
[A].
[B].
[C].
[D].
Answer: Option A
Explanation:
|
Formula for converting from km/hr to m/s: X km/hr = |
X x | 5 | m/s. | ||
| 18 |
| Therefore, Speed = | 45 x | 5 | m/sec | = | 25 | m/sec. | |
| 18 | 2 |
Total distance to be covered = (360 + 140) m = 500 m.
| Formula for finding Time = | Distance | ||
| Speed |
| Required time = | 500 x 2 | sec | = 40 sec. | |
| 25 |