Physics problem.. need answer asap.. please?

uring volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. Figure 4-51 shows a cross section of Mt. Fuji, in Japan. (a) At what initial speed would a bomb have to be ejected, at angle θ0 = 33˚ to the horizontal, from the vent at A in order to fall at the foot of the volcano at B, at vertical distance h = 3.80 km and horizontal distance d = 9.20 km? Ignore, for the moment, the effects of air on the bomb's travel. (b) What would be the time of flight?