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Car a and car B go from AB to ab respectively and meet each other after 9 hours. Car a runs 20 km less per hour than car B. the speed ratio of the two cars is 7 to 9 How many kilometers are the two places apart? Let's explain the formula and method!! *-*
AB distance:
20 ÷ (9-7) × (9 + 7) × 9 = 1440 km
It is known that car a is 20 km slower than car B per hour, and the speed ratio of car a and car B is 5:7,
How many kilometers are the two places apart?
The speed of car B: 20 △ 7-5 * 7 = 70 km / h, car a: 20 △ 7-5 * 5 = 50 km / h
A B = (70 + 50) * 6 = 720 km
A and B start from city a and B at the same time, and run in opposite directions. They meet at the place 20km away from the midpoint. When they meet, the distance ratio of a and B is 7:6. How many kilometers are there between city a and B?
20×2÷（7-6）×（7+6）
=40×13
=520 km
A: the whole journey is 520km
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