Question
Working alone, A can do a job in 15 days and B can do
the same job in 18 days. In how many days will the job be completed if both work together?Solution
AÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â B 15 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 18 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 90 (total work) Â Â 6Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 5Â Â Â Â Â Â Â Â Â Efficiency Take total time =90/6+5 = 90/11
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