Chapter 6.1, Problem 18E

A trough is 10 feet long and 2 feet across the top. It's sides are isosceles triangles with altitudes of 2.5 feet. If water is being pumped out of the tank at a rate of 5 cubic feet per second, find the following:  find the rate, in feet per second, at which the water level is changing at the instant the water level is at 1.25 feet. In ft/s

What is the greatest constant of variation

A police car is parked 50 feet due north of a stop sign on straight road. A red car is travelling towards the stop sign from a point 160 feet due east on the road. The police radar reads that the distance between the police car and the red car is decreasing at a rate of 90 feet per second. How fast is the red car actually traveling along the road? The actual speed (along the road) of the red car is (Note: Think right triangle.) (Enter your answer as a decimal number rounded to 2 places.) feet per second

Please show all work. And circle your answer. Thank you!!