the volume of water that overflows when a pyrex Beaker filled to the Brim with 250 cm cube of water at 20 degree Celsius is equal to 60 degrees Celsius to cubic expansivity of pyrex as 0.09 * 3 raise to power - 4°c take cubic expansivity of water 2.1×10-⁴

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?