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數學

有一天XXX去爬山,總花6小時,上山每小時3公里,下山每小時4公里,請問總長多長????[/size][/size]

設上山km 為x
∵ 上山km = 下山km

上山所需時間   = x(km) ÷ 3(km/h) -----(1)   
下山所需時間   = x(km) ÷ 4(km/h) -----(2)

∵ 總花時間  = 上山所需時間  +  下山所需時間

∴        x/3 + x/4 = 6
    4x/12 + 3x/12 = 6
                 7x/12 = 6
                      7x = 72
                        x = 72/7 km

*** 作者被禁止或刪除 內容自動屏蔽 ***

看到數學都累了[058e8b09

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