Multiple Choice Questions on Pipes A and B can fill a tank in 12 and 15 hours respectively Pipe C can empty it in 6 hours If A an........... for IBPS RRB - Officers Exam Preparation

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Multiple Choice Questions

Pipes A and B can fill a tank in 12 and 15 hours respectively Pipe C can empty it in 6 hours If A an...........

Quantitative Aptitude(IBPS RRB PO) Pipes&cistern
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    Pipes A and B can fill a tank in 12 and 15 hours respectively. Pipe C can empty it in 6 hours. If A and B are kept open for 5 hours in the beginning and then C is also opened. Now In how many hrs tank will be empty?

    42 hours 

    Incorrect Answer

    43 hours 

    Incorrect Answer

     45 hours 

    Correct Answer

    50 hours 

    Incorrect Answer

    None of these

    Incorrect Answer
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    Explanation:

    Let capacity of tank = 60 units

    Efficiency of A =60/12= 5 units/hour

    Efficiency of B = 60/15= 4 units/hour

    Efficiency of C = 60/6= - 10 units/hour

    Efficiency of A and B together = 5 + 4 = 9 units/hour

    Tank filled in 5 hours = 9 x 5 = 45 units

    Efficiency of A, B and C together = 5 + 4 – 10 = - 1 unit/hour

    Hence, time taken to empty the tank= = 45 hours

    By: Munesh Kumari
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