A circular bicycle path is 1km long. Dodi rode a bicycle for two rounds at the speed of 30kph. If he wants to average 40kph, what should be his speed for the next four rounds?
請翻成中文
並解答和過程
1km times2=2km(first two rounds)
2km devided by 30kph=0.0666....(time he spend for the first two rounds)
because average kph means all distance devided by all time so 1km times 6(all rounds)=6km
6km dvided by 40kph=0.15(all the time he should spend)
0.15-0.0666...=0.0833334...
4km devide by 0.0833334 =47.999961kph
回應
predictor
Re: bicycle
2008-01-27 00:452km devided by 30kph=0.0666....(time he spend for the first two rounds)
because average kph means all distance devided by all time so 1km times 6(all rounds)=6km
6km dvided by 40kph=0.15(all the time he should spend)
0.15-0.0666...=0.0833334...
4km devide by 0.0833334 =47.999961kph
一個圓自行車道路是1km長。 Dodi騎了一輛自行車前二圈以30kph的速度。 如果他想要平均為40kph，什麼應該是她下四個回合的速度？
1km times2=2km (前二圈)
2km由30kph=0.0666劃分了….(他前二圈花費的時間)
，因為平均kph代表所有時刻除以所有距離，因此1km乘6 (所有距離) =6km
6km由40kph=0.15 (他全部應該花費的時間)
0.15-0.0666… =0.0833334…
4km由0.0833334 =47.999961.....=answer
對不起沒看清楚要我翻譯成中文我還用英文作答呢!不對要跟我講
quietroit
Re: bicycle
2008-03-27 14:36