A delivery van drives for 30 minutes and travels 50 miles. The delivery van turns around and drives 20 miles in 15 minutes. The van waits at this location for 5 minutes. Turns around again and drives another 100 miles for 65 minutes.

What is the displacement?

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?