
用英语回答
tomranoncearoundaringtrack,wgichis360meters.duringthefirsthalfofthewholetime,hisspeed...
tom ran once around a ring track ,wgich is 360 meters .during the first half of the whole time ,his speed was 5 meters every second .during the second half ,his speed was 4meters every second .how many seconds did he spend on the second half of the whole way ?
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distance of the second half: 360/2 = 180 (m)
time spent on the second half: 180 / 4 = 45 (s)
time spent on the second half: 180 / 4 = 45 (s)
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