Question

一列快车和列慢车分别同时从甲、乙两城相对开出,经过4小时两车相遇,

Answer 1

设慢车速为xkm/h,则快车速为(x+16)km/h

4(x+16)=7/12[4(x+16+x)]

4x+64=7/12[4(2x+16)]

4x+64=7/12[8x+64]

4x+64=14/3x+112/3

4x+(64-112/3)=14/3x

4x+80/3=14/3x

80/3=2/3x

x=40,(x+16)=56

(40+56)×4=384(km)

故甲乙两城相距384km

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