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The distance between a and B is 450 km. A car drives 360 km from a to B in 4 hours. How many more hours can the car reach B according to this speed?
Drive another hour
The distance between a and B is 360 km. The car starts from a place to B place. After 2.5 hours, it exceeds the midpoint of 20 km and the car stops
What's the speed of the car
（360×1/2+20）÷2.5
=200÷2.5
=80 km / h
A car goes from a to B. It takes two fifths of the whole journey in eight hours. How many hours does it take to complete the whole journey?
Using the proportion equation to solve the problem
It takes x hours to complete the whole journey
2/5:8=1：x
X = 20 hours
How many hours does it take to complete the whole journey?
How many hours does it take to complete the whole journey?
One and a fifth △ two fifths = 3 hours
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