1.

1). 20 hours2). 18 hours3). 16 hours4). 25 hours

Answer»

Time taken by pipe A to FILL a tank = 36 HOURS

Part of the tank filled by pipe A in 1 hour = 1/36----(1)

Time taken by pipe B to fill a tank = 45 hours

Part of the tank filled by pipe B in 1 hour = 1/45----(2)

Adding equations 1 and 2,

Part of the tank filled by pipe A and B both in 1 hour $(= \frac{1}{{36}} + \frac{1}{{45}} = \frac{{5 + 4}}{{180}} = \frac{9}{{180}} = \frac{1}{{20}})$

∴ Time taken by pipe A and B both to fill the tank completely = 20 hours



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