Shaoyang ocean mingzhu property

(1) 1.8 minutes, Dragon Boat Team A is in the leading position;

(2) Dragon Boat Team B reaches the finish line first;

(3) The analytical formula of Jiajia Dragon Boat Team is y=kx,

Then 1000=4k 1, k 1 =250,

∴ The analytical formula of Dragon Boat Team A is y=250x,

The analytical formula after 2.2 minutes is y=k 2 x+b,

Then,

Solution:

The analytical formula of Dragon Boat Team B after 2.2 minutes is y=375x-425.

According to the meaning of the question,

∴ ,

3.4 minutes after the start of the race, Dragon Boat Team B began to take the lead.