A scuba diver uses an empty vertical tube, closed at the top and open at the bottom, to measure her depth below sea level when diving in the ocean. The tube is 7.20 cm long. She dives below the surface until the water has risen into the tube a distance of 2.31 cm from the open end of the tube. Assuming the temperature of the air in the tube stays constant during the dive, what is the diver's depth at this point? The average density of sea water is 1,030 kg/m3.

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?