家（H)與學校（S)的距離是x, A的速度是a, B的速度是b,
x-xb/a=D1, x-(x+D1)b/a=D2, → x*D2=D1*D1
Answer 1: x=147, D1=84, D2=48;
Answer 2: x=192, D1=72, D2=27.
x-xb/a=D1, x-(x+D1)b/a=D2, → x*D2=D1*D1
Answer 1: x=147, D1=84, D2=48;
Answer 2: x=192, D1=72, D2=27.
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