x+(2000-x)*3/2=(3000-x)*2/3+x(要走最远2轮要同时耗尽,x代表轮子1作为后轮时行驶的路程)
解得：x=1200
sum=1200+（2000-1200）*3/2=2400
2400
A man is thinking about travelling in China by bike.His fron
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