1.

1). 1 hour 15 minutes2). 1 hour 20 minutes3). 1 hour 12 minutes4). 2 hour 24 minutes

Answer»

<P>⇒ Part filled by P ALONE in 1 HOURS = 1/6

⇒ Part filled by Q alone in 1 hours = 1/4

⇒ Part filled by (P + Q) in 1 hours = (1/6 + 1/4) = 5/12

∴ Both the taps together will FILL the tank in = 12/5 hours = 144 minute = 2 hours 24 minute



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