A. Can do a piece of work in 7 days of 9 hours each, and b can do it in 6 days of 7 hours each. How long will they take to do it, working together 8 2/5 hours a day?
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Answer:
3 days
Step-by-step explanation:
A can complete a work in (7×9)=63 hours
B can complete work in (6×7)=42 hours
A's 1 hours work =1/63
B's 1 hours work = 1/42
(A+B)'s 1 hours work= (1/63 + 1/42)
= 5/126
both will finish the work in 126/5 hours
number of days of 8 2/5 hours each
=126/5 ÷ 8 2/5
=126/5 ÷ 42/5
= 126/5 × 5/42
= 3 days
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