设AB相距X千米,甲速为：Y千米/小时,则：乙速为：2Y/3千米/小时.
X-(X/(Y+(2Y/3))*(2Y/3))-((X-(X/(Y+(2Y/3))*Y)/(1.2*Y))*1.3*(2Y/3)=14
X-(X/(1+(2/3))*(2/3))-((X-(X/(1+(2/3)))/(1.2))*1.3*(2/3)=14
X-(X/(5/3))*(2/3))-((X-(X/(5/3))/(1.2))*1.3*(2/3)=14
X-(3X/5)*(2/3)-((X-(3X/5))/(1.2))*1.3*(2/3)=14
X-(2X/5)-(2X/5)/(1.2)*1.3*(2/3)=14
3X/5-(2X/5)*1.3*(2/3)/(1.2)=14
3.6X/5-(2X/5)*1.3*(2/3)=14*1.2=16.8
3.6X-2X*1.3*(2/3)=84
10.8X-2X*1.3*2=252
10.8X-5.2X=252
5.6X=252
X=252/5.6=45千米
AB相距45千米.