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venom_h
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Homework Statement
A balloon is rising at a constant speed of 5ft/s. A boy cycling along a straight road at a speed of 15 ft/s. When he passes directly under the balloon, it is 45 ft above him. how fast is the distance between the boy and the balloon increasing 3 seconds later?
Homework Equations
s^2= x^2+y^2
dx/dt = 15ft/s; dy/dt = 5ft/s
The Attempt at a Solution
2s(ds/dt)=2x(dx/dt)+2y(dy/dt)
Now, the problem is, how do i find the general equation for me to pluck in the t?