Chung is a scientist who invented a new material that absorbs water in a cup so that the water does not drip when the cup is turned upside down. She thought that the material might be good for cleaning up spills at home. Which of the following will help Chung the most in her investigation to see if the material will be good for this task?

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?