If a car goes from place a to place B, it can arrive one hour ahead of time, It can arrive one hour in advance. How many kilometers are there between a and B? Do it in the way of primary school, speed up!

If a car goes from place a to place B, it can arrive one hour ahead of time, It can arrive one hour in advance. How many kilometers are there between a and B? Do it in the way of primary school, speed up!

In both cases, one hour in advance
S/1.2V=100/V+(S-100)/1.3V
1/V[S/1.2-100-(S-100)/1.3]=0
1.3S-156-1.2S+120=0
S=360

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