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B and B leave from ab at the same time. When they meet, the distance ratio of B and B is 6:5. After meeting, B is 11 kilometers faster than before, As a result, the two vehicles arrive at the destination at the same time. It is known that Party B has a total of 9 hours Last year, there were 600 red goldfish and black goldfish in the pond. This year, a quarter of the red goldfish swam away, while the number of black goldfish increased by a third. Therefore, there are 534 red goldfish and black goldfish in the pond this year. How many of them are red goldfish?
The speed ratio is 5:6, the speed of a = 11 (6 / 5-5 / 6) = 30 km / h, the time of B = the total length of a = 9 * 30 = 270 km. 2 suppose there were 600-x black goldfish (1-1 / 4) x + (1 + 1 / 3) (600-x) = 5343 / 4x + 800-4 / 3x = 5347 / 12x = 266X = 456456456456 * (1-1 / 4) = 342
A and B leave from a and B at the same time, and meet each other after 4 hours. The speed of a is five fourths of that of B, and the distance of B per hour is shorter than that of B
How many kilometers are there between a and B
B speed 10 / (5 / 4-1) = 40
Jiasu 40 + 10 = 50
Distance between the two places (40 + 50) * 4 = 360 km
A total distance of 240 km, a and B car relative drive, driving 1.5 hours, they met, a car's speed is B car 3 / 5, ask B car how many kilometers per hour?
1 / 2 of a number is 20% more than 25%. Ask this number for the first time and give me more advice,
If the speed of car B is x, the speed of car a is 3 / 5x
(x + 3 / 5x) * 1.5 = 240, x = 100
Bus B travels 100 kilometers per hour
Let this number be X
x/2-25%x=20 x/4=20 x=80
The number is 80
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