The distance between two cities is 1200 km. How long will it take, in h, to drive from one city to the other if your average speed is 63 mi/h? Express your answer to two significant figures and include the appropriate units

explanation:

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )