# What is the water flows speed? If

A rectangular reservoir is 80 decimetres long and 45 decimetres broad. Water flow into it through a pipe with cross-section 3 cm x 3 cm. If water rises 1 decimetres in 2 hours in the reservoir, the speed (in decimetres.hour) at which water flows is

- 20000
- 20500
- 10000
- 15000