請幫忙計數列式
2007-09-01 8:42 pm
Alan swam 0.4 km in 3 min 20seconds. Betty took 2 min to swim 0.25km. who was the faster seimmer?
回答 (4)
2007-09-01 8:53 pm
✔ 最佳答案
3min20s=200s2min=120s
Speed of Alan,
0.4 / 200
=0.002 km/s
Speed of Betty,
0.25 / 120
=0.002083... km/s
Ans. Betty was the faster swimmer
參考: myself
2007-09-02 12:07 am
Betty
2007-09-01 10:56 pm
Aian=0.4/(3x60+20)=0.002km/s
Betty=0.25/(2x60)=0.0020833km/s
Betty was faster
Betty=0.25/(2x60)=0.0020833km/s
Betty was faster
2007-09-01 8:52 pm
Alan speed = [0.4/(3*60+20)] km/s <-- km per second
= 0.002 km /s
Betty speed = [0.25/(2*60)] km/s <-- km per second
= 0.00208 km/s
※PS: km/s is NOT a SI unit. But it doesn’t matter for comparisons.
2007-09-01 12:53:12 補充：
So, Betty swims faster.
= 0.002 km /s
Betty speed = [0.25/(2*60)] km/s <-- km per second
= 0.00208 km/s
※PS: km/s is NOT a SI unit. But it doesn’t matter for comparisons.
2007-09-01 12:53:12 補充：
So, Betty swims faster.
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