Question
A can complete a work in 12 days, and B can complete the
same work in 18 days. How many days will they take to complete the work if they work together?Solution
A’s rate of work = 1/12 B’s rate of work = 1/18 Together, their rate of work = 1/12 + 1/18 = (3 + 2) / 36 = 5/36 So, the time taken to complete the work together = 36/5 = 7.2 days Correct option: b
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