1 Provide an appropriate response.

If xy2= 4 and dx/dt = -5, then what is dy/dt when x = 4 and y = 1?

2.Solve the problem. Round your answer, if appropriate.

One airplane is approaching an airport from the north at 209 km/hr. A second airplane approaches from the east at 240 km/hr. Find the rate at which the distance between the planes changes when the southbound plane is 32 km away from the airport and the westbound plane is 25 km from the airport.