Equation solution: (1) Suppose A ran x meters when chasing, then B ran (x-800) meters.
x÷200/3=(x-800)÷200/3.5
The solution is x = 5600.
The time required for A to catch up with B is 5600 ÷ 200/3- 1 = 83 (minutes).
(2) Set A to catch up with B after (X- 1) minutes.
200/3 x-200/3.5 x=800
The solution is x = 84.
x- 1=83
Arithmetic solution: 800 ÷ (200/3-200/3.5)-1= 83 (minutes).
After answering, I feel that this question has appeared many times in Baidu Know, and many netizens have given various answers. One of the answers was "59 points" (respondent gg009 1), which was actually chosen as the "best answer" and won "favorable comments" from several people. There are also "40", "84", "83" and "77" (the reference answer of "easy win" is also "77", and the answer of this website hnnnd2008 is also "77", so it was selected as the "best answer"). ......
In fact, "83 points" is accurate ("84 points" is very close to the correct answer, but due to some negligence-I didn't consider that 84 points is the rest time for two people. Some answers are correct or very close to correct, but there is no standardized answering process, which makes the questioner feel at a loss. Ironically, however, one questioner chose the wrong answer as the "best answer" and ignored the correct answer. The answer to this question once again exposed the sorrow of mathematics!