tennis problem unsolvable?

1. The problem statement, all variables and given/known data

1. Consider tennis net which is 2 ft high at its center point; the service line is 20 ft from the net, and the baseline is 30 ft from the net. You have a bullet-like service that travels in a straight line, just clearing the net before hitting the service line.
a) What angle does the trajectory of this serve make with the horizontal?
b) At what height above the ground is the ball struck with the racket?
2. Relevant equations
1)i dont know how i would find an angle without given one? do i need to assume?
2)dont know where to start

3. The attempt at a solution
1)please help spent hours trying to solve this problem

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