state gov DSSSB Patwari Mock Test Quantitative Aptitude Time and Work Work Efficiency

A can do a piece of work in 40 days. He works on it for 5 days and then B alone finishes the remaining work in 21 days. Working together, A and B could have completed the work in:

1
12 days
2
15 days
3
18 days
4
24 days
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