'A' can do a piece of work in 20 days, 'B' in 30 days and
'C' in 40 days. All of them start the work all together but
'A' leaves it after 5 days and 'C' before 10 days of
completion. Then 'B' completes the work. Find the total
time taken by the work
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total time taken is 15+ (15/7) days= 120/7 days
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