Multiple choice

P can do a job in 10 days, Q can do the same job in 12 days and R can do the same job in 15 days. In how many days they will finish the work together?

  1. 2

  2. 4

  3. 6

  4. 12
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rates: P=1/10, Q=1/12, R=1/15. Combined rate = (6+5+4)/60 = 15/60 = 1/4. Time = 4 days.

AI explanation

Using the Least Common Multiple method, let the total work be 60 units, which gives daily work rates of 6 units for P, 5 units for Q, and 4 units for R. Working together, their combined daily rate is 15 units. Dividing the total 60 units by their combined daily rate gives a completion time of 4 days.

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