6) Two planes leave an airport at the same time, one flying east, the other flying west. The
eastbound plane travels 150 mph slower. They are 2250 miles apart after 3 hr. find the speed of
each plane.
7) A rectangular window has a width 2 ft less than its length. The perimeter is 24 ft. Find the
length and width of the window.
8) A chemist needs to mix 20L of a 40% acid solution with some 70% acid solution to obtain a
mixture that is 50% acid. How many liters of the 70% acid solution should be used?
9) Find two consecutive odd integers such that when the lesser is added to twice the greater, the
result is 24 more than the greater integer.