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Dhoni can do a piece of work in 80 days. He works at it for 10 days and then Virat alone finishes the work in 42 days.
How many number of days would be taken by the two together to finish the work.
Work done by Dhoni in 10 days=(1/80)*10=1/8
Now 7/8 work done by virat in 42 days.
whole work will be done by virat in 42*(8/7)=48days
Dhoni's 1 days work=1/80 & Virat's 1 days work=1/48
(Dhoni+Virat)'s 1 days work=[(1/80)+(1/48)]=8/240=1/30
so both will finish the work in 30days
trick => upper multiply and lower is addition-dhoni work
so will finish the work in 30 days
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