Question

Two taps A and B can fill a cistern in 6 hours and 9 hours respectively. In the beginning, both taps are opened but after 3 hours first tap is turned off. How much longer will the tank take to fill?

75 minutes

1 hour

1.5 hour(s)

2 hour(s)​

Answer 1

Answer:

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Answer 2

1.5 hrs more will be taken  by TAP B to completely fill the cistern

Step-by-step explanation:

Two taps A and B can fill a cistern in 6 hours and 9 hours respectively.

A can fill in 1 hr  = 1/6

B Can fill in 1 Hr  = 1/9

A & B Together can fill in 1 hr = 1/6 + 1/9

= (3 + 2)/18

= 5/18

in 3 Hrs they can fill = 3 * 5/18  = 5/6

Cistern remained to fill = 1 - 5/6 = 1/6

B can fill cistern in 9 hrs

=> B can fill 1/6  in 9/6 = 1.5 hrs

1.5 hrs more will be taken

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