Two planes leave an airport at the same time and travel in opposite directions. one plane averages 300 miles per hour, and the other plane averages 600 miles per hour. when will they be 2,700 miles apart?

Ineed to know the answer to this algebra question.

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a