railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Time and Work Work Efficiency

A does 75% of a work in 57 days, then he calls in B and they together finish the remaining work in 9 days. How long B alone would take to do the whole work?

1
78 days
2
58.4 days
3
68.4 days
4
68 days
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