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The two trains left the two cities at the same time. After 2.4 hours, they were still two fifths of the distance. It is known that car a is one fifths faster than car B every hour How long is the railway between the two cities? It's 660km, isn't it?
(1-2 / 5) ∶ 2.4 = 1 / 4,
The speed ratio of a and B is (1 + 1 / 5): 1 = 6:5,
Then (1 / 4) × [5 / (6 + 5)] = 5 / 44,
Therefore, the railway length of the two cities is 45 △ 0.6 △ 5 / 44 = 660 km
Car a can travel 48 kilometers per hour, car B can travel 20 kilometers in 35 minutes. How many kilometers per minute can car a and car B travel? Which car is faster?
A: 48 / 60 km / min = 4 / 5 km
B 20 / 35 km / min = 4 / 7 km
A is fast
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A car can travel 20 kilometers in 28 minutes, B car can travel 9 kilometers in 12 minutes, which car is fast? Why?
The latter is fast, 9 out of 12 and 20 out of 28
The speed of train a from a to B is 60 km / h, and that of train B from B to a is 90 km / h. The two trains start from 8:00 a.m. at the same time. It is known that a and B are 200 km apart. What time do they meet?
Let two cars meet after X hours, according to the meaning of the question: 60x + 90x = 200, the solution is: x = 43, a: the two cars meet at 9:20 in the morning
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