maths
2008-06-11 2:19 am
John ran 4.5km in 18 min. Peter ran 7020m in 2份之1 hour. Whose speed was higher?
回答 (3)
2008-06-11 3:18 am
✔ 最佳答案
1 kilometres = 1000 metres7020m = 7020m / 1000km = 7.02km
1 hour = 60 minutes
18 min = 18 min / 60 min = 0.3hr
Distance = Time x Speed
Speed = Distance / Time
Speed of John = 4.5 km / 0.3 hr = 15 km/h
Speed of Peter = 7.02 km / 0.5 hr = 14.04 km/h
Therefore, John’s speed is higher.
2008-06-11 2:45 am
4.5km = 4500m
1/2 hr = 30minutes
or
7020m = 7.02km
18min = 0.3hour
Speed of John = 4500/18 m/min = 250m/min
Speed of Peter = 7020/30 m/min = 234m/min
Speed of John = 4.5/0.3 = 15km/hr
Speed of Peter = 7.02/0.5 = 14.04km/hr
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001的單位不太清楚 不過分數歸他吧
1/2 hr = 30minutes
or
7020m = 7.02km
18min = 0.3hour
Speed of John = 4500/18 m/min = 250m/min
Speed of Peter = 7020/30 m/min = 234m/min
Speed of John = 4.5/0.3 = 15km/hr
Speed of Peter = 7.02/0.5 = 14.04km/hr
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001的單位不太清楚 不過分數歸他吧
2008-06-11 2:39 am
John : (4.5 x 1000) / (18 x 60)
= 4.1667 m/s
Peter : 7020 / (0.5 x 60 x60)
= 3.9 m/s
Thus John has a higher speed
= 4.1667 m/s
Peter : 7020 / (0.5 x 60 x60)
= 3.9 m/s
Thus John has a higher speed
參考: me
收錄日期: 2021-04-13 15:41:06
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