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

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is 

1
\(\frac{1}{4}\)
2
\(\frac{1}{10}\)
3
\(\frac{7}{15}\)
4
\(\frac{8}{15}\)
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