數學問題(兩地之間的距離)

設AB距離x
x/48+3=x/36
x/36-x/48=3
48x/1728-36x/1728=3
12x/1728=3
x/144=3
x=432千米(km)

let x h be the time that car A is traveling.

x + 3 is the total used time

48x is the total distance travelled by A
36( x+3) is total distance travelled by B

AS they should be equal
so. 48x = 36(x +3)
after solving.
x=1/9

required distance = 1/9 times 48
=16/3 km

2010-05-24 23:18:00 補充：
sorry x should be equal to 9

so required distance should be 9 times 48
= 432 km

甲車速度48千米/小時, 途中停下修車3小時, 行駛9小時, 48x9=432

乙車速度36千米/小時, 3+9=12, 行駛12小時, 36x12=432

AB兩地之間的距離=432kM

把................................................................................................................
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