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Q.

Two taps can fill a tank in 12 min and 18 min respectively. Both the taps are kept open for 2 min and then the tap that fills the tank in 12 min is turned off. In how many more minutes will the tank be filled?

 A.

9

 B.

12

 C.

13

 D.

10

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Solution:
Option(C) is correct

In 2 minutes, the taps fill \(2\left(\dfrac{1}{12}+\dfrac{1}{16}\right)\) or \(\dfrac{5}{18}\)of the tank.

Therefore, \(\left(\dfrac{13}{18}\right)^{th}\)of the tank is to be filled by the second tap at the rate of \(\dfrac{1}{18}\) of the tank per minute.

This will take another 13 minutes.


(1) Comment(s)


Kyrie
 ()

isn't it 1/18 instead of 1/16 in the first part