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(A and B start from ab at the same time and run in opposite directions. They meet in 6 hours. It is known that the speed ratio of a and B is 9:7, and B runs 72 km less than a when they meet How many kilometers are the two places apart?
When they meet, car B runs 72km less than car a
Then, the speed of B is 72 △ 6 less than that of a = 12 km / h
Speed of a: 9 × 12 / (9-7) = 54 km / h
Speed of B: 7 × 12 / (9-7) = 42 km / h
The distance between the two places: 6 × (54 + 42) = 576km
The speed ratio of the two vehicles is 8:9. How many kilometers do the two vehicles travel per hour?
612 △ 4.5 = 136 (km), 8 + 9 = 17136 × 817 = 64 (km), 136 × 917 = 72 (km). A: car a travels 64 km per hour, car B 72 km per hour
A and B leave 340 kilometers apart from each other at the same time. They run in opposite directions and meet each other in 4 hours. The speed ratio is 8:9. How many kilometers do they travel
1 and 4 / 5 times 1.25-1 and 1 / 4 times 6.2
It's a system
A = 340 × 8 ^ (8 + 9) = 160 km;
B = 340-160 = 180 km;
1 and 4 / 5 times 1.25 + 1 and 1 / 4 times 6.2
=(1.8+6.2)×1.25
=8×1.25
=10
Solve the equation 4 * (x-0.8) = 8;
x-0.8=2;
x=2.8;
If you don't understand this question, you can ask,
The two fast and slow trains start from the two places of AB which are 360 kilometers away at the same time. After 2.5 hours of meeting, it is known that the fast train is 1.2 times faster than the slow train, and it is 12 kilometers more
If the local train runs x kilometers per hour, the express train runs 1.2x + 12 kilometers per hour
2.5x+2.5(1.2x+12)=360
2.5x+3x+30=360
5.5x=330
x=60
The express train runs 1.2x + 12 = 1.2 × 60 + 12 = 84km per hour
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