A works 5/4 times fast as 'B', B is able to complete a work in 12 days find the time in which they can complete the work together
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A work 5/4 time faster than B
B one day work =1/12
A one day work = 1/12×5/4 = 5/48
both together 1 day work= 1/12+5/48=9/48
Answer = 48/9
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