This is a two-dimensional horizontal projectile problem. Most candidates demonstrated familiarity with the question. It was well attempted. The expected answer is
t = d/v R = U[2H/g]½
=25/4 = 6.25s OR H =
H = ½ gt2
= ½ x 10 x (25/4)2 =(252 * 10)/(2*42)
= 195.3m = 195.3m