A pipe can empty a cistern in 40 minutes. Find the time in which 3/4 part of the cistern will be emp

M4maths Previous Puzzles

07 Dec 2021 cistern

A pipe can empty a cistern in 40 minutes. Find the time in which 3/4 part of the cistern will be emptied.

OPtion

1. 25 minutes
2. 28 minutes
3. 32 minutes
4. 40 minutes
5. 30 minutes
6. 36 minutes
7. 38 minutes
8. 32 minutes
9. 29 minutes
10. None of the above

Solution

1/40 part of the cistern is emptied in = 1 minute.
∴ 3/4 part of the cistern is emptied in
= 40 × 3/4 = 30 minutes.

Correct Option: 5 Best Solution (2)