There are four students in the fourth grade math problem clinic waiting for the doctor to treat them. A takes an injection for 3 minutes, B changes gauze for 4 minutes, and C applies it for 3 minutes.

Generally speaking, they are doctors, and the four of them need time respectively: 1, 2, 3, 4. No matter who is treated first, others are waiting, and those who need less time should be ranked first. The required time is:

1* 3+2 * 2+3 *1=10 minutes.

If you want to explain it roughly like this: suppose that the time required by four people is A, B, C and D, then

The total time of (seeing a doctor in sequence) is 3a+2b+c, which means that the sum of the minimum hours of A is the smallest.

I hope I can help you with a math problem.

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