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Two donkeys are standing 400 metres apart. First donkey can run at a speed of 3 m/sec and the second can run at 2 m/sec. If two donkeys run towards each other after how much time (in seconds) will they bump into each other?
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- 60
- 80
- 400
- 40
Correct Option: B
Distance between both donkeys = 400 metre.
Relative speed = (3 + 2) m./sec. = 5 m./sec.
| ∴ Required time = | |
| Relative speed |
| = | = 80 seconds | |
| 5 |
