Solve the given problem:
Problem: A cannon is fired over level ground at an angle of 30 degrees to the horizontal. The initial velocity of the cannonball is 400 m/s but because the cannon is fired at an angle, the vertical component of the velocity is 200 m/s and the horizontal component is 346 m/s.
Part A: How long is the cannonball in the air (use 10 m/s2 and the fact that the total time of flight is twice the time required to reach the high point)?
Any expert will able to provide correct answer for the above problem.