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The speed ratio of car a and car B is 7:8. From a to B, car a takes 4 hours. How many hours does car B take? That ~ the answer is not 3. Because the speed of a is faster than that of B, it is 7: if it is 3.5, B is faster than a!
It takes 3.5 hours for car B
It takes x hours to set up B car
8X=4×7
X=3.5
So B car to 3.5 hours, I wish the school smoothly
That ~ A is faster than B = 7:8 means that a's speed is 7 / 8 of B's speed, so B should be faster than a
Car a and car B leave from a to B 324km away. Car a starts 0.8h later than car B. as a result, the two cars arrive at the same time. The speed ratio of car a and car B is 9:7
How many kilometers does car B travel per hour
B speed = 7 × 324 × (9-7) / (0.8 × 7 × 9) = 90 km / h;
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