Two particles A and B are situated 10 m apart along X axis, B being farther right of A, at $$t = 0$$. Particle A is moving at 0.75 m/s parallel to +Y axis while B at 1 m/s along -X axis. After a time t they come closest to each other. Therefore, t is

A

4.8 s

B

6.4 s

C

6.0 s

D

3.2 s