Quantitative Aptitude Time and Work Work Efficiency

A boy alone can complete a work in 20 days while a woman alone can complete the same work in 15 days. Efficiency of 1 man is 25% more than that of 1 woman. 1 man, 1 woman and 1 boy together can complete the work in:

1

6

2

8

3

5

4

4

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