A can do a certain work in 12 days. B is 60% more efficient than A. How many days will B and A together take to do the same job?
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of days as A takes to do 100% of work. B is 60% more efficient than A, means that the rate of B is 1.6 times as greater as that of A. So, if A can complete the job in 12 days, then B complete the same job in 12/1.6 = 12/(8/5) = 15/2 = 7.5 days.
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A B
100. 160 ( Efficiency)
5. 8 ( efficiency)
8 5 (days)
12/8*5=7.5 ( B's days )
total work =60
together take to do the job :
60/13=4 8/13
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