Two faucets X and Y can fill a tank in 20 hours and 30 hours respectively. If both the faucets are opened together, the tank will be full in?

16 hrs

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20 hrs

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6 hrs

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10 hrs

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12 hrs

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Solution

The correct option is E
12 hrs

Time taken by X = 20 hours

Time taken by Y = 30 hours

Time taken by X and Y = $\frac{30 \times 20}{30 + 20}$ = 12 hours

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Two faucets X and Y can fill a tank in 20 hours and 30 hours respectively. If both the faucets are opened together, the tank will be full in?

The correct option is E 12 hrs Time taken by X = 20 hours Time taken by Y = 30 hours Time taken by X and Y = 30×2030+20 = 12 hours

The correct option is E
12 hrs

Time taken by X = 20 hours

Time taken by Y = 30 hours

Time taken by X and Y = $\frac{30 \times 20}{30 + 20}$ = 12 hours