The bullet dropped takes 4 seconds so you can calculate the height by using the formula
s = ut + 1/2 at^2
her u = 0
s = 1/2 10 16 = 80 m
similarly if the bullet is porjected horizontally also it will take 4 seconds to reach the ground.
Remember that there is no acceleration in horizontal direction.
so
distance travelled in horizontal direction = time initial component
= 4 150
=600 meters
There you have your answer. Hope it helps
