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From place a to place B, Xiaohua first rides a bicycle to complete half of the whole journey. The speed is 12 kilometers per hour, and the rest walks, 4 kilometers per hour. The average speed of the whole journey is 12 kilometers per hour
Speed = distance / time
Speed = 1 / (0.5 / 12 + 0.5 / 4)
=1/（1/6)
=6 km / h
Someone rides a bicycle from place a to place B. in the first 20 minutes, he completes 25 minutes of the whole journey. Then he speeds up and walks 60 meters more per minute than before. After another 15 minutes, he is still 1.8 kilometers away from place B. how many kilometers are there between place a and place B?
Suppose that the distance between a and B is x kilometers, according to the meaning of the question, we can get the equation: (1-25) x - (25X △ 20 + 0.06) × 15 = 1.8, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & 35x-310x-0.9 = 1.8, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp
A car travels 135 kilometers in 3 hours. How many hours does it take to travel 360 kilometers?
Think: --- = --- + ---
It is required to travel 360 km in time
In this problem, we need to find the speed of the car first, and then find the travel time of 360 km according to "time = distance / speed":
135 / 3 = 45 km The speed of a car
360 / 45 = 8 hours Travel time to destination
A car can travel 300 kilometers in 5 hours. According to this calculation, how many hours does it take to travel 360 kilometers
300 / 5 = 60 (km / h)
360 / 60 = 6 hours
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