Aplane has a cruising speed of 100 miles per hour when there is no wind. at this speed, the plane flew 600 miles with the wind in the same amount of time it flew 400 miles against the wind. find the speed of the wind

the dissolution of polymer can be thermodynamically described in 2 steps.

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.