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A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely ?
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- 4 hours
- 4 hours 15 minutes
- 3 hours 15 minutes
- 3 hours 45 minutes
- 4 hours
Correct Option: D
A tap can fill the tank in 6 hours. In filling the tank to its half, time required = 3 hours.
| Remaining part = | ||
| 2 |
∵ 1 tap takes 6 hours to fill the tank
| ∴ Time taken by 4 taps take to fill 1 / 2 of the tank = | × | = | hours | |||
| 4 | 2 | 4 |
| ∴ Total time = 3 + | |
| 4 |
| Total time = 3 | hours | |
| 4 |
Therefore , Total time = 3 hours 45 minutes
