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The distance between a and B is 400 kilometers. A car drives from a to B for 300 kilometers in 4 hours. At this speed, how many hours will it take to finish the journey
It will take x hours to finish
400-300：300=X：4
300X=100*4
X=400/300
X=4/3
It's still 4 / 3 hours away
Math problem! Hurry up
The fruit wholesale Department of a city wants to transport a batch of fruits from a city to the city for sale. There are two modes of transportation: train and car. The loss in the process of transportation is 200 yuan / hour
Transportation: average speed on the way (km / h): 100 freight: (yuan / km) 15 handling charge: 2000
Vehicle: average speed on the way (km / h): 80 freight: (yuan / km) 20 handling charge: 900
(1) if the total cost of the car is 1100 yuan more than that of the train, do you know how many kilometers is the distance between the city and city a
(2) if the distance between a city and a city is s kilometers, and you know that the train and car delay time on the road is 2 hours and 301 hours respectively, if you are the manager of the fruit wholesale Department of a city, when s is the value, the total expenditure of the car and the train is equal?
1. (1) 400 meters
It is suggested that the distance between this city and a city is x km,
According to the meaning of the title, 200 &; + 15x + 2000 = 200 &; + 20x + 900-1100
Solving this equation gives x = 400
(2) When the total cost of a train and a car is the same, what is the difference
.
Solving this equation, s = 160
That is: when the distance between the city and city a is more than 160 km, it is more cost-effective to choose train transportation;
When the distance between the city and city a is equal to 160 km, either train or car can be used;
When the distance between the city and city a is less than 160 km, it is more economical to choose automobile transportation
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