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Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together, then after how many hours should B be closed so that the tank is full in 4 hours?
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- 2/3 hrs
- 1 hrs
- 2 hrs
- 8/3 hrs
- 2/3 hrs
Correct Option: D
As per the given in question , we have
| Part of the tank filled in 4 hours by pipe A = | = | ||
| 6 | 3 |
| Remaining part = 1 - | = | ||
| 3 | 3 |
| Time taken by pipe B in filling | part = | hours | ||
| 3 | 3 |
We can find required answer with the help of given formula :
Here, p = 6,q = 8, t = 4
| Required time = |  | q |  | 1 - |  |  | |
| p |
| Required time = | | 8 | | 1 - | | | |
| 6 |
| Required time = | hours | |
| 3 |
