Primary school students think that there is a travel problem in the sixth grade of mathematics, and the travel problem is a basic problem in the primary school Olympics. There are nearly ten kinds of trip problems, such as meeting problems and chasing problems. , is one of the questions. Trip problems include multi-person trip, second encounter, multiple encounters, train crossing the bridge, boat running, circular runway, clock face trip, stop-and-go, pick-up, etc.

Detailed description:

In order to correctly solve the application problem of "travel problem", it is necessary to find out the specific situation of object movement. Such as the direction of movement (opposite, opposite, same direction), departure time (simultaneous, different), departure place (same place, different places), movement route (closed, not closed), movement result (meeting, how far apart, crossing, catching up).

When two objects move, the direction of movement has a great relationship with the speed of movement. When two objects move towards each other or towards each other, the velocity at this time is the sum of the velocities of the two objects (velocity sum for short). When two objects move in the same direction, the speed of catching up with each other becomes the difference of the speed of the two objects (speed difference for short)