1, let the distance be l, the riding speed be v 1, the riding time be h 1, the walking speed be v2 and the walking time be 2*h 1.

v 1 =(2L/3):h 1；

v2=(L/3):2h 1

V 1:v2=4: 1. So the speed of cycling is 4 times that of walking, and the speed of cycling is 4- 1=3 times faster than walking.

You can do a simple calculation with your mouth: it takes twice as long to walk half the distance by bike, so the walking speed is 65438+ 0/4 of the riding speed. )

2. According to the meaning of the question, the speed in Tao Tao is 4 kilometers per hour, and between 4 and 5 o'clock, the total distance in Tao Tao is reduced by 4* 1=4 kilometers.

The reduced distance is 4 kilometers, the reduced time is 1/3 hours, and dad's driving speed is =4/( 1/3)= 12 kilometers/hour.

Tao Tao came home from school and had to go home by bus because his bike was broken. . No problem. . .

4. "If they are in a row, 5 meters apart from each other, start with the first one. . . "Well, at least give me a speed or time. . . It's all about distance. . .

5. Fish ponds. . . From the final result, we can know that the water level line is 3.2 meters high.

6. If all three raw materials are used, the maximum savings can be1-(1-30%) (1-45%) (1-25%) =1-0.28875 = 7.