A large storage tank, open to the atmosphere

Question

at the top and filled with water, develops a
small hole in its side at a point 18 m below
the water level. The rate of flow of water from
the leak is 1.6 × 10−3 m3
/min.
Determine the speed at which the water
leaves the hole. The acceleration of gravity is
9.81 m/s
2
.
Answer in units of m/s