A man cycles 12km to school every day at an average speed of 20km/h. On one particular day he cycled for a while, but then for a puncture. He walked the rest of the way at 4km/h. It took him an hour to get to school that day. How far did he walk?

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of california was approximately two times the population of florida. b. the population of florida was approximately twenty times the population of california. c. the population of florida was approximately two times the population of california. d. the population of california was approximately twenty times the population of florida.