【Question 16】
A team 50 meters long, moving from east to west at a speed of 3 meters per second, and another team 60 meters long, moving from west to east at a speed of 2 meters per second. The time required from when the leaders of the two teams meet until the last members of the teams part ways is $\qquad$ seconds.
【Analysis and Solution】Travel problem, train crossing a bridge, meeting of two vehicles. It requires $(50+60) \div(3+2)=22$ seconds.