Please solve it quickly

Question 4: A cannon, located on a 30.0 m height cliff above the ocean, was fired with a velocity of 35.0 m/s with an angle of 40.0 above the horizontal. A. Determine horizontal distance from the base of the cliff where the cannonball lands. (Note: you will need to find the time of flight first) (A:3) B. An enemy ship was spotted at 285 m away from the base of the cliff, derive an equation that can be used to solve for the angle that is required to sink this ship. Solution to the equation is not necessary. (1:2) Question 5: A swimmer can swim at 2.5 km/hr in still water is trying to across the river that is 3.0 km wide. The river is flowing at 1.4 km/hr in relation to the ground. What would be the direction he needs to head so that he will land directly across the river? How long will it take for him to cross? You need to sketch the vector diagram, then determine the answer. (1:2, C:2)