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A tap can fill an empty tank in 12 hours and another tap can empty half the tank in 10 hours. It both the taps are opened simultaneously, how long would it take for the empty tank to be filled to half its capacity ?
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- 30 hours
- 20 hours
- 15 hours
- 12 hours
- 30 hours
Correct Option: A
As per the given in question , we have
| Part of the tank filled by pipe A in 1 hour = | ||
| 12 |
| Part of the tank emptied by pipe B in 1 hour = | ||
| 20 |
| Part of the tank filled in 1 hour = | - | = | = | ||||
| 12 | 20 | 60 | 30 |
∴ Tank will be filled in 30 hours.
