Formal Solution: No formal solution this week. Water flowing down a river at a rate of $300,000\frac{L}{s}$ until it reaches a waterfall. The river at the point of the waterfall is $20$ m across and $20$ m deep. At this point what would be the average speed of the water in the river? Once the water has gone over the falls the river widens to $60$ m and deepens to $40$ m $.$ What is the average speed of the water after the waterfall?