The speed ratio of a and B is 3:4. It is known that when a finishes one third of the whole journey, there is still a distance from the meeting point 20km, how many km is the distance between AB and ab? Try not to use equations
The distance between the meeting point and a 3 / (3 + 4) = 3 / 7
The distance between the two places is 20 ÷ (3 / 7-1 / 3) = 20 ÷ 2 / 21 = 210km
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