JEE Main Physics question

The distance between two particles moving towards each other is decreasing at the rate of 6 m/sec. If these particles travel with the same speeds and in the same direction, then the separation increases at the rate of 4 m/sec. The particles have speeds as [RPET 1999]

• (A)5.5 m/sec : 0.5 m/sec
• (B)5 m/sec : 1 m/secCorrect
• (C)4 m/sec : 1 m/sec
• (D)4 m/sec : 2 m/sec