7.1. Halfway between Vasya's house and school stands a traffic light. On Monday, Vasya caught the green light. On Tuesday, he walked at the same speed but waited at the traffic light for 5 minutes, and then doubled his speed. On both Monday and Tuesday, he spent the same amount of time on the journey from home to school. How much?
# 7.1. Answer: 20.

By doubling his speed, Vasya covered half the distance in half the time. According to the problem, this took 5 minutes less than usual. This means that normally he covers half the distance in 10 minutes. And the entire journey from home to school takes 20 minutes. By doubling his speed, Vasya covered half the distance in half the time. According to the problem, this took 5 minutes less than usual. This means that normally he covers half the distance in 10 minutes. And the entire journey from home to school takes 20 minutes.