The second law of thermodynamics leads us to conclude that A. it is theoretically possible to convert heat into work with 100% efficiency. B. disorder in the universe is increasing with the passage of time. C. the average temperature of the universe is increasing with the passage of time, D. the total energy of the universe is constant. E. the entropy of the universe remains constant.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?