A and Band C can finish a job in 12,15 amd 20 days respectively they worked together for 2 days and then Cleft. how ich will A and B take to finish the job
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Step-by-step explanation:
A and B together do (1/12) +(1/15) = (5/60) + (4/60) = 9/60 or 3/20th of the work in a day. So the two working together will take (3/5)/(3/20) = (3*20/(5*3) = 4 days. A and B will complete the work in 4 days after C had left them.
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