Pipe A can fill a tank in 12 hours and pipe B can empty the tank in 18 hours. Both pipes are opened at 6 a.m. and after some time pipe B is closed and the tank is full at 8 p.m. At what time was the pipe B closed ?A. 10 a.m.B. 8 a.m.C. 9 a.m.D. 11 a.m.

Pipe A can fill a tank in 12 hours and pipe B can empty the tank in 18

1.	Pipe A can fill a tank in 12 hours and pipe B can empty the tank in 18 hours. Both pipes are opened at 6 a.m. and after some time pipe B is closed and the tank is full at 8 p.m. At what time was the pipe B closed ?A. 10 a.m.B. 8 a.m.C. 9 a.m.D. 11 a.m.
Answer» Correct Answer - C (i) Tank was filled in 14 hours, i.e., pipe A worked for 14 hours. (ii) Tank is filled in 14 hours. (iii) Pipe A is opened for 14 hours and let pipe B is opened for x hours. (iv) Frame the equatin and solve for x. i.e.,`(14)/(12)-(x)/(18)=1`

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