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The distance between a and B is 100 kilometers. Xiaoming rides a bicycle from a to B. three hours later, Xiaogang also rides a motorcycle from a to B, and arrives two hours earlier than Xiaoming. If Xiaogang's speed is 2.5 times that of Xiaoming,
Let Xiaoming speed be x km / h
Small rigid speed 2.5x km / h
From a to B, xiao gang spent five hours less than Xiao Ming
100/x-100/2.5x=5
x=12
2.5x=30
Xiaogang's speed is 30 km / h
It takes Xiaoming half an hour and Xiaogang 20 minutes to ride a bicycle from place a to place B. what is the simplest ratio of the speed of Xiaoming and Xiaogang
Speed ratio: 1 / 30:1 / 20 = 2:3 = ratio 2 / 3
The distance between the two cities is 225 km. A bus and a truck leave the two cities at the same time. They meet 2.5 hours later. It is known that the speed ratio of the truck to the bus is 4:5. How many kilometers do the bus and the truck travel per hour?
The speed of passenger car is: 225 △ 2.5 × 54 + 5, = 225 △ 2.5 × 59, = 50 (km / h), the speed of freight car is: 225 △ 2.5 × 44 + 5, = 225 △ 2.5 × 49, = 40 (km / h). A: passenger car travels 50 km per hour, freight car travels 40 km per hour
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