1.

A tap can fill a tank in 10 hours. After filling half the tank, four more similar taps are opened. What is the total time taken to fill the tank completely?1). 5 hours 45 minutes2). 6 hours3). 5 hours 48 minutes4). 6 hours 45 minutes

Answer»

Given, a tap can fill a TANK in 10 hours.

∴ In 1 hour, the tap fills 1/10th PART of the tank.

To fill half the tank, time required = 5 hours.

Now, part of tank EMPTY = ½

Given, 4 more similar taps are opened.

∴ In 1 hour, 5 taps fill part of tank = 5 × 1/10 = ½

∴ to fill the half filled tank, the taps require 1 hr.

Total time taken = 5 hr + 1 hr = 6 hr


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