human
Bob's school track is 400 meters. If Bob ran the first lap in 70 seconds, the second and third lap in 85 seconds each, what was his average speed in (m/s) for his entire run?
assistant
How many meters are in each lap? ** If each lap is 400 meters long, then 3 laps will have a total distance of 400*3 = <<400*3=1200>>1200 meters
How many seconds did Bob run? ** The total time he ran was 70 on the first lap + 85 on the second one and 85 on the third lap, so his total running time was = 70+85+85 = <<70+85+85=240>>240 seconds
What was Bob's average speed? ** His average speed then is measured by the total distance he ran (1200) divided by the total time required (240) or 1200/240 = <<1200/240=5>>5 m/s
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