[計量] OG 12th p.23 Q24
大概是太久沒有算數學了，
思考上有點卡住的感覺，
一直想不出來該怎麼算
24.Aaron will jog from home at x miles per hour and then walk back home by
the same route at y miles per hour.
How many miles from home can Aaron jog so that he spends a total of t hours
jogging and walking?
A) (xt)/y
B) (x+t)/(xy)
C) (xyt)/(x+y)
D) (x+y+t)/xy
E) (y+t)/x - t/y
正確答案是C
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