58. The distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with
same speeds and in the same direction, then the separation increase at the rate of 4 m/sec. The
particles have speeds as [RPET 1999)
(a) 5 m/sec; 1 m/sec
(b) 4 m/sec; 1 m/sec
(c) 4 m/sec; 2 m/sec
(d) 5 m/sec; 2 m/sec
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