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The distance between a and B is 40 kilometers. A person starts from a place to B at a speed of 10 kilometers per hour. Suppose that the person starts x hours later and is y kilometers away from a place (1) Write the function relation of Y with respect to x, and point out the definition field of function (2) Draw an image of this function
1、 Y=10X
X(0,4）
Y(0,40）
2. Draw the diagonal line from (0,0) to (4,40)
The distance between a and B is 200 kilometers. Cars and trucks drive from a to B respectively. Cars travel in 4 hours and trucks arrive in B in 5 hours. The speed of trucks is several percent slower than cars
Car speed = 200 △ 4 = 50 km / h
Truck speed = 200 △ 5 = 40 km / h
Slow = (50-40) △ 50 = 20%
When a car goes from place a to place B, it is planned to travel 40 kilometers per hour and arrive in 7 hours. In fact, it travels 25% more per hour than planned. How many hours can it arrive?
40 × 7 ^ [40 × (1 + 25%)], = 280 ^ 50, = 5.6 (hours); a: 5.6 hours
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