RRB NTPC · Question 77

A container has two holes. The 1^st hole alone empties the container in 15 minutes and 2^nd hole alone empties the container in 10 minutes. If water leaks out at a constant rate, how long (in minutes) does it take if both the holes together empty the container?

1. A

   6

2. B

   \(\frac{1}{6}\)

3. C

   \(\frac{1}{7}\)

4. D

   7