answer is 38min 24sec.
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Answer:
45km/hr in m/s = 12.5m/s
the perimeter of the rectangular track= 2(400+800)
=2400m
12 laps = 12*2400= 28800m
time = distance / speed
= 28800/ 12.5
=2304 secs
=2304/60. (in mins)
38.4 mins
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