1. The inlet to a tank can fill it in 4 hours while the outlet to the tank can empty it in 5 hours Both the pipes were opened at 9 Am but after sometime the outlet was closed and it is observed that the tank was full at 5 PM. At what time was the outlet closed ?





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  • By: anil on 05 May 2019 02.41 am
    Let the outlet be open for x hours. Let there be 100 units of water in the tank.  So, the speed of inlet is 25 units per hour and speed of the outlet is - 20 units per hr.  Let them be open for x hours. So, the total tank filled is 25 x - 20x =5x For 8 - x hours the inlet is open. So, units of water = (8-x)*25 But that sum = 100 5x + 200 - 25 x = 100 20 x = 100 So, x = 5 hours. ie till 2 PM
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