A can do a piece of work in 6 days working 8 hours a day while B can do the same work in 4 days working 10 hours a day. If the work has to be completed in 5 days, so how many hours do they need to work together in a day?
A) 59/11 B) 48/11 C) 70/11 D) 65/11
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Answer:
c is correct answer jhh
Answered by
1
Answer:
no of Man- hours required by A- to complete the work alone= 9 x 6= 54
no of Man- hours required by B- to complete the work alone = 4 x 9= 36.
no of Man- hours required by both A and B to complete the work together
= (54 x36)/(54+36) = (54 x36)/90
= 21.6- Man- hours.
If they work 5 & 2/5- hours a day, then Number of days required to complete the work= 21.6/(27/5)
= (216/10) x 5/27
= 4- days
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