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

    Question

    P and Q together finish a

    piece of work in 12 days. R works at half the efficiency of P. Q alone can finish the work in 30 days. Now if Q and R work together to complete 2/3 of the job, and R is working at twice his usual efficiency, find how many days they will take.
    A 8 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 12 Correct Answer Incorrect Answer
    D 20 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, P’s one day’s work = 1/12-1/30 = (5-2)/60 = 3/60 = 20 days So, P complete the work in 20 days. Let, total work is 120. Efficiency of P and Q is 6 and 4 respectively. R’s efficiency is = 6/2 = 3 So, required time is = [(120×(2/3))/(6+4)] = 8 days.

    Practice Next
    More Time and work Questions

    Relevant for Exams:

    ask-question