10.) A and B can finish a piece of work in 6 days and 10 days respectively. A began the work and worked at it for
2 days. He was then joined by B. Find the total time taken to complete the work.
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Answer:
A=1/6
B=1/10
A+B=(5+3) /30
Total work =30
A's one day work. =5
B's one day work. =3
A+B one day work=8
A for first 2 days= 5*2=10
Remaining work=30-10=20
20 work by A and B
20/8=2.5 days
Total time=2+2.5=4.5 days
Work By A for 2 days
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