Question

Two planes leave an airport at the same? time, one flying? east, the other flying west. the eastbound plane travels 90 mph slower. they are 3480 mi apart after 4hr. find the speed of each plane.

Answer 1

2x + 2(x-90) = 3480

2x + 2x - 180 = 3480

4x = 3660

x = 915 mph Plane 1 westbound

915-90 = 825 mph plane 2 eastbound