5. Solving problems by arithmetic is more convenient than equation;

It is better to solve problems with column equations than with arithmetic.

5.

Solution:

According to the meaning of the question,

After 5 minutes, the sum of the distances traveled by both parties is: 960-400 = 560;

In ...

The distance traveled by A is 50×5=250.

rule

The distance traveled by B is: 560-250=3 10,

Walking every minute: 3 10÷5=62 (meters).

6.

Solution:

If the number of stamps collected by B is X, then the number of stamps collected by A is 4x.

According to the meaning of the question, there are

4x-9=x+9

solve

x=6

∴ A originally had 4×6=24 stamps;

B There used to be six stamps.