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The two cars leave from a and B and meet at 2.5km from the midpoint. It is known that the speed ratio of the two cars is 5:4 and the distance between the two places is () km
45；
If the distance is set as s, then the distance for fast driving is (0.5s + 2.5), and the distance for slow driving is (0.5s-2.5);
For the same travel time, the distance ratio is equal to the speed ratio
5) / (0.5s-2.5) = 5 / 4
s=45
After two hours of meeting, the speed ratio of a car and B car is 5:4, and B car is finished
342/2=171
171*4/(5+4)=76
342 / 76 = 4.5 (hours)
It takes 4.5 hours for car B to complete the whole journey
The speed ratio of car a and car B is 4:7. The two cars leave from two places at the same time and meet at a distance of 15 kilometers from the midpoint. How many kilometers is the distance between the two places
When they met, the distance ratio of a and B was 4:7
When they met, a car went
4÷（4＋7）＝4/11
The distance between the two places
15 (1 / 2-4 / 11) = 110 km
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