📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

    Question

    There are two pipes to fill a tank. Together, they can

    fill the tank in 15 minutes. If one pipe can fill the tank in one and a half times as fast as the other, the faster pipe alone can fill the tank in:
    A 10 minutes Correct Answer Incorrect Answer
    B 25 minutes Correct Answer Incorrect Answer
    C 20 minutes Correct Answer Incorrect Answer
    D 32(1/2) Correct Answer Incorrect Answer

    Solution

    Let the slower pipe fill the tank in x minutes.  The faster pipe fills it in 2x/3 minutes (since it's 1.5 times faster). Their combined rate is: 1/x + 3/2x = 1/15 ⟹ 5/2x = 1/15 ⟹ x = 37.5 mins (slower pipe) The faster pipe takes: 2/3 x 37.5 = 25 mins

    Practice Next
    More Previous year papers Questions

    Relevant for Exams:

    ask-question