How Do You Calculate Average Force from Power and Velocity?

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If a car generates a 15000W of power when travling at a constant 80km/h what must be the average force exerted by the car due to air resistance?

I have no idea what to do!

thanks rav
 
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Force*speed = power. Can you do it now?
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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