Correct Answer - C
Time taken by projectile to reach the bottom of tube from point of projection is
`9-16-g t :. T=(7)/(10)=0.7 sec. `
During this time particle travels `12xx0.7m`
`=8.4m ` horizontally.
`:. ` Take distance `=8.4m + 12.5 cos 37^(@)`
`=.4+10=18.4m.`