defence exam CISF Constable Driver 2025 Quantitative Aptitude Time and Work Work Efficiency

A can finish a work in 10 days. B can finish the same work in 12 days. The days required to finish the work by both of them together are

1

1\({1 \ \over 11}\)

2

2\({5\ \over 11}\)

3

5\({5\ \over 11}\)

4

4\({3\ \over 11}\)

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