Vishwanath
Monday, February 18, 2013
27. | 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 | B. | 42 sec | C. | 45 sec | D. | 48 sec |
|
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 |
| | | | |
Title : Trains Q27
Description : 27. 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 B. 42 sec C. 45 sec D. 48...
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