A can do a job alone in 6 days. B can do 3 times that job in 10 days and C can do 5 times that job in 20 days. If all of them work together, they will finish one job in :
Explanation:
To complete the same piece of work, A takes 6 days, B takes 10/3 days, C takes 20/5 = 4 days
∴ 1A+1B+1C = 16+310+14 = 10+18+1560=4360
They will finish the job in 60/43 days.
Hence, option (b).
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