Question

A plane flying with a constant speed of 24 km/min passes over a ground radar station at an altitude of 5km and climbs at an angle of 35 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 4 minutes later?

I know side A=5 but how do i get side B and C and with angle 35 What equation i need to do my implicit differentiation? plz help

X = 24 t cos 35
dX/dt = 24 cos 35
Y = 5 + 24 sin 35
dY/dt = 25 sin 35
R^2 = X^2 + Y^2
You want dR/dt when t = 4
2R dR/dt = 2X dX/dt + 2Y dY/dt
Compute X, Y and R when t=4 and then solve for dR/dt