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The second volume of the second day of junior high school solves mathematical problems
Suppose: Xiaoming walks at a speed of y meters per minute and rides a bike at a speed of 3 meters per minute.

According to the meaning of the question, the equation is: 2400/Y-2400/3Y=20.

Solution: Y=80

Test: substitute Y=60 into the fractional equation, and the denominator is not 0. Y=80 is the root of the equation.

So: (1) Xiaoming walks at a speed of 80m/min.

Time for Xiao Ming to walk home: 2400/80=30 (minutes).

It takes Xiaoming 2 minutes to pick up the ticket at home.

Xiao Ming needs to ride a bike to the gym (at a constant speed): 2400/240= 10 (minutes).

Xiao Ming * * * Time: 42 minutes.

At this time, there are still 3 minutes before the game.

So: (2) Xiao Mingcan rushed to the gym before the game started.