railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency

A can do 1/5th of a work in 4 days and B can do 1/6th of the same work in 5 days. In how many days they can finish the work, if they work together?

1
12
2
20
3
15
4
30
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