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Inlet P is 4 times faster than inlet Q to fill a drum. If P alone can fill it in 30 min, how long will it take if both the pipes are opened together?1. 15 min2. 12 min3. 48 min4. 24 min |
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Answer» Correct Answer - Option 4 : 24 min Given: P alone can fill = 30 min Inlet P is 4 times faster than inlet Q to fill a drum Calculation: Time taken by P to fill the drum = 30 min ∴ time taken by Q to fill the drum ⇒ 30 × 4 ⇒ 120 min ∴ required time taken ⇒ (30 × 120)/(30 + 120) ⇒ (30 × 120)/150 ⇒ 24 min If both the pipes are opened together it takes 24 min to fill the drum. |
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