Complicated maths question? Need help?

How do you do this question? 1. A space shuttle was launched straight up, and its altitude is given by h = 10 t^2 after t seconds. You are on the ground 500 metres away from the launch site watching the shuttle going up. The line of sight from you to the rocket makes an angle x with the horizontal. By how many... show more How do you do this question?

1. A space shuttle was launched straight up, and its altitude is given by h = 10 t^2 after t seconds. You are on the ground 500 metres away from the launch site watching the shuttle going up. The line of sight from you to the rocket makes an angle x with the horizontal. By how many radians per second is x changing ten seconds after the launch?
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