Time of flight of projectile (T)=2+8=10s Horizontal distance between two points ‌=u‌cos‌45∘×8−u‌cos‌45∘×2 ‌=6u‌cos‌45∘ ‌T=‌
2usin‌θ
g
=‌
2usin‌45∘
10
‌10=‌
2usin‌45∘
10
‌u=50√2m∕s Horizontal distance between two points =6×50√2×‌