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A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x)
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xy hours y - x - x – y hours
- y – x hours
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xy hours x - y
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Correct Option: A
When both pipes are opened simultaneously,
| Part of the tank filled in 1 hour = | - | = | |||
| x | y | xy |
| ∴ Required time = | hours | |
| y - x |
