JEE Main Physics question

A man drops a ball downside from the roof of a tower of height 400 . At the same time another ball is thrown upside (from the ground) with a velocity 50 . From the surface of the tower, then they will meet at which height from the surface of the tower [CPMT 2003]

• (A)100 m
• (B)320 m
• (C)80 mCorrect
• (D)240 m