(50+50× 1.5)x+50×2=600

125x+ 100=600

125x=500

x=4

S=vt

S=Vo+at(Vo is initial velocity and A is acceleration)

V 2-VO 2 = 2as (V, VO is the initial and final velocity, and A is the acceleration).

The opposite direction in mathematics

Two objects start from two places and walk in opposite directions. After some time, they are bound to meet on the road. This kind of problem is called meeting problem. The problem of meeting is to study the relationship between speed, time and distance. It is different from the general travel problem in that it is not the movement of an object, so the speed it studies includes the speed of two objects, that is, the sum of speeds.

The relationship problems encountered are:

Speed and × meeting time = distance;

The sum of distance and speed = meeting time;

Distance ÷ Meeting time = speed and.

Formulas can be used directly for problems with simple ideas and methods, and formulas can be used after modification for complex problems.

Refer to the above content: Baidu Encyclopedia-Do the opposite