An airplane reaches its cruising hight. at this height it travels at a constant speed, or rate and travels 2,000 mile in 4 hours. what is the rate of the plane? if the estimated cost per mile of the plane is $20, what is the cost of the 4 hour travel?

The plane would be travelling at a exactly 500 miles per hour, which can be determined by simply dividing the miles by the hours. 

As for the cost, the overall cost would be $40,000 which can be determined by multiplying the cost per mile by the amount of miles.