Could someone please help me with this physics problem?

A 247kg projectile, fired with a speed of 134 m/s at a 51.0 degree angle, breaks into three pieces of equal m at the highest point of its arc (where its velocity is horizontal). Two of the fragments move with the same speed right after the explosion as the entire projectile had just before the explosion; one of these moves vertically downward and the other horizontally. How would you determine the direction of the velocity of the third fragment immediately after the explosion?