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The distance between the two cities is 480 kilometers. Two vehicles a and B leave from 20% at the same time. Three hours later, car a runs 2 / 3 of the whole journey and car B runs 3 / 4 of the whole journey Which car is closer to the destination? How many kilometers is the nearest car from the destination?
Car a: 1 - 2 / 3 = 1 / 3 = 4 / 12
Car B: 1 - 3 / 4 = 1 / 4 = 3 / 12
B is nearer to the finish line
480 × 1 / 4 = 120 km
Car B is 120 km away from the terminal
The distance between the two places is 480 km. Two vehicles a and B leave the two cities at the same time. Three hours later, car a runs 2 / 3 of the whole journey and car B runs 3 / 4 of the whole journey. Which vehicle is in the middle of the distance
The midpoint is half of the whole distance
2 / 3 of the whole journey, 2 / 3-1 / 2 = 1 / 6
3 / 4 of the whole journey of car B, over the midpoint: 3 / 4-1 / 2 = 1 / 4
Because 1 / 4 ＞ 1 / 6, car a is closer to the midpoint
In this problem, 480 km is a redundant condition
The distance between AB and B is 420 kilometers. It takes 6 hours to complete the whole journey, and it takes 5 hours for B. now a and B leave from ab at the same time. A few hours later, they will make up for each other
After the cars met, they were 30 kilometers apart?
20: 40 no wait
Let t hours satisfy the condition
Va=420/6=70km/h,Vb=420/5=84km/h
According to the meaning of the title, (VA + VB) * t - 30 = 420
Substituting known: (70 + 84) T - 30 = 420
The solution is t = 225 / 77 = 2.92h
To sum up, it will take 2.92 hours for the two vehicles to meet, and then they are 30 kilometers apart
After 2 hours, the ratio of the distance that a has traveled to the whole journey is 2:5. B has traveled 1 / 3 of the whole journey, and then the two cars are on the way
Connect
At this time, the distance between the two vehicles is 96km, and the total length of the road is calculated
2. In basketball match, 3 points will be scored for one shot outside the three-point line and 2 points will be scored for one shot inside the three-point line. In one match, Wang Jieyu scored a total of 21 points. How many three pointers did he hit? (no free throw, no equation)
1.96/(1-2/5-1/3)=360
2.21/3=7
There are four possibilities
7 3-pointer
Five three, three two
Three three, six two
One three, nine two
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