1.

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

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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