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把電扶梯想成平面
一層樓一單位 d/8（位移）

電扶梯靜止,小明上爬時 小明上升速度（想程前進速度）V1= d /(8t1)
電扶梯上升,小明不動時 小明上升速度（想程前進速度）V2= d /(8t2)

在上升電扶梯

1.小明爬上一層歷時T秒？
小明前進與電扶梯同方向,V = v1+v2=d/(8T)

d /(8t1)+d /(8t2) = d/(8T)
T = t1t2 / ( t1+t2 )

1.小明爬下一層歷時T秒？
小明前進與電扶梯反方向,V =| v1-v2 | = d/(8T)

| d /(8t1) - d /(8t2) | = d/(8T)
T = t1t2 / | t1 - t2 |

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