RRB NTPC · Question 20

A jug has two holes. The 1^st hole alone makes the jug empty in 15 minutes and 2^nd hole alone makes the jug empty in 20 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the jug? A. 4/7 B. \(7\frac{4}{7}\) C. \(8\frac{5}{7}\) D.\(8\frac{4}{7}\)

1. A

   B

2. B

   C

3. C

   A

4. D

   D