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A and B can separately complete a piece of work in 20 days and 30 days respectively.

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A and B can separately complete a piece of work in 20 days and 30 days respectively. They worked together for some time, then B left the work. If A completed the rest of the work in 10 days, then B worked for : 

(a) 6 days 

(b) 8 days 

(c) 12 days 

(d) 16 days

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1 Answer

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Best answer

Correct option (a) 6 days

Explanation: 

A’s 10 days work = 10×3 units/days =30 units

So, (60-30)=30 units of work would have been 

done by A and B both and it took time:

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