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A bucket can be filled by a pipe in 10 minutes and by another pipe in 40 minutes. Both the pipes are kept open for 5 minutes and then first pipe is closed. After this, how much time will be required to fill the complete bucket?1). 30 minutes2). 10 minutes3). 15 minutes4). 25 minutes |
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Answer» PART filled by PIPE A in 1 minute = 1/10 Part filled by pipe B in 1 minute = 1/40 (A + B)’s 10 minute work = 5 × (1/10 + 1/40) = 5/8 REMAINING work = 1 – 5/8 = 3/8 ⇒ 1/40 : 3/8 = 1 : x ⇒ 1/15 = 1/x ⇒ x = 15 ∴ remaining time is 15 MINUTES |
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