Calculus
posted by Mehak .
A plane flies horizontally with a speed Of 600km/h at an altitude of 10km and pasess directly over th town of quinton .find the rate at which the distance from the plane to quinton is increasing when its 20km away from quinton ?

Not sure why the oblique distance needs to be calculated, but that's what the question asks.
The solution is similar to the cone problem.
dx/dt=600 km h^{1}
h=10 km
x=20 km
L=sqrt(x²+h²)
dL/dx=x/sqrt(x²+h²)
dL/dt
=(dL/dx) * (dx/dt)
=(x/sqrt(x²+h²)) * (600 km h^{1})
=600x/sqrt(x²+h²) kmh^{1}
=537 kmh^{1}
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Someone had helped me yesterday, but I need it broken down more because I honestly don't understand any of this?