5 and 6 please

5. Car 1 is driving east a 60 km/h and Dave is driving north at 70 km/h. Both cars are approaching the intersection of the two roads. When Car 1 is 0.4 km from the intersection, the rate of the distance between the two cars is decreasing by 90 km/h. How far is Car 2 from the intersection when Car 1 is 0.4 km from the intersection. 6. A water trough is 15 m long and has a cross section in the shape of an equilateral triangle that is 1.5 m across. The trough is being filled with water at a rate of 0.5 m3/minute. How fast will the water level rise when the water is 50 cm deep