The man at A wishes to throw two darts at the target at B so that they arrive at the same time.

Part A
If each dart is thrown with a speed of 8.8m/s , determine the angle ?C at which the first dart should be thrown. Note that the first dart must be thrown at ?C(>?D), then the second dart is thrown at ?D.
Find ?C = ?

Part B
Determine the angle ?D at which the second dart should be thrown.
Part C

Determine the time between each throw.
Please show work and this problem is different than the one in the book.