Question

1.A and B can separately do a piece of work in 20 and 30 days respectively. They work
together for some time and then B stops. if A completely the rest of the work in 10
days, then B has worked for
A. 6 days.
B. 12 days. C. 16 dnys. D. 18 days.
​

Answer 1

Answer:

D.18 days

Step-by-step explanation:

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Answer 2

Answer:

12 days is answer

Step-by-step explanation:

(A+B)=1/20+1/30)=(3+2/60)=12 days