On Tuesday, I played on the playground with some friends. During the lunch break, I sat in the corner with them to have a rest.

At this time, a classmate suddenly thought of a topic about squirrels and rabbits playing football, so he asked, "Squirrels and rabbits are playing football. Squirrels kick 20 balls per hour and rabbits kick 30 balls per hour. It's half past one in the afternoon. When does the squirrel rabbit kick 90 balls in the afternoon? "

Everyone couldn't think of it at once, so they said in unison, "Where are the pens and draft paper?" So, another student said, "In fact, the solution to this problem is simple: first calculate how many minutes do squirrels and rabbits score a goal on average?" How many minutes does it take to score 90 goals? Finally, add one point ten to the required time, and you can work out when a * * * will score 90 goals.

I didn't expect a small math problem to be related to life. It seems that life cannot be separated from mathematics.