1.

1). 12 hours2). 14 hours3). 16 hours4). 20 hours

Answer»

Time TAKEN by pipe 1 to FILL = 4 HOURS

Time taken by pipe 2 to empty = 5 hours

Let capacity of cistern = LCM (4 and 5) = 20 units

Efficiency of pipe 1 = 20/4 = 5 units/hour

Efficiency of pipe 2 = 20/5 = –4 units/hour

Total Efficiency of pipe 1 and pipe 2 together = 5 – 4 = 1 unit/hour

⇒Total time taken to fill the cistern = 20/1= 20 hours



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