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When doing math homework, a student accidentally knocked over the ink bottle, so that only the following words could be seen in an assignment: "a and B are 40 km apart, the speed of the motorcycle is 45 km / h, the speed of the truck is 35 km / h, the truck goes y hours ahead (where y is a constant) how far is the motorcycle from B to catch up with the truck?
Pursuit distance: 45y
Speed difference: 45-35 = 10
Pursuit time: 45y / 10 = 4.5y
If the motorcycle is chased in land B, the distance between the motorcycle and land B is 40 * 4.5y = 180y (km)
If the motorcycle is chasing in Jiadi, the motorcycle is (40-180y) km away from Jiadi
A junior high school student is doing homework, accidentally knocked over the ink bottle, is an assignment, only to see the following words
The distance between a and B is 40 kilometers, the speed of motorcycle is 45 kilometers per kilometer, and the speed of truck is 35 kilometers per hour
Supplement (1) if two vehicles travel in the same direction from two places, the motorcycle is behind the car, and the motorcycle is behind the car, how many hours can the motorcycle catch up with the car?
Supplement (2) if two vehicles travel in the same direction from two places at the same time, after a few hours, the distance between the two vehicles is 20 km?
Supplement (3) if the motorcycle is in land a and the car is in land B, and two colleagues of the two cars are facing each other, and there is a traffic jam due to too many vehicles when they meet, the motorcycle has to find another way to land B. the car can only go to land a along the original road, and the car can only arrive in land a 10 minutes after the motorcycle arrives at land B?
1. 40 / (45-35) = 4 hours 2, (40-20) / (45 + 35) = 0.25 hours 3. When the two cars meet, the motorcycle goes 45 × [40 / (45 + 35)] = 22.5 km, the car goes 40-22.5 = 17.5 km, so it takes (22.5 / 35 + 22 / 60) hours from the meeting to the car arriving at the first place, so the motorcycle goes to the second place
Alas, in the past few days, our class always failed because of its poor strength. This is exactly "()"
Confucius moves: all books (lose)
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