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Question 73
A person A can complete a work in 15 days working 8 hours daily. A second person B can complete the same workin 20 days working 7 hours a day. If both A and B work together, working 7 hours a day, then the number of days required to complete that workis
Solution
Total hours required by A = 120 hours
Total hours required by B = 140 hours
Total hours needed by both working together = (120*140)/260 = 840/13 hours
But, A and B work 7 hours each day
Hence, total days required together = 840/(13*7) = 120/13 days
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