Which set of side lengths can be used to form a right triangle

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14

When steve woke up. his temperature was 102 degrees f. two hours later it was 3 degrees lower. what was his temperature then?