both are kept open, how long Will it take to fill the tank? 9. A and B can finish a piece of work in 6 days and 4 days respectively. A started work and worked for 2 days. He was then joined by B, find the time taken to finish the work.
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A 6 2
B 4 3
A+B 12/5 5
1 work 4days
2/3 work in 2/3 ×4 =8/3 =2 2/3 days
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