Answers

2014-05-05T21:49:34+05:30
Relative speed of car 1 (with speed = 60 kmph) w.r.t car 2 (with speed = 42 kmph) is 18 kmph = 5 m/s. now distance car 1 has to travel to overtake car 2 = 5+5 = 10 m.
hence time taken = distance / speed = 10/5 = 2 sec.
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at least you bothered to answer after one month. but i found the answer my self after 1 hr