Kin travels 440 miles by train at an average speed of 110 mph. Ayaan flies the same distance at an average speed of 880 mph.
Find the difference between their travel times.
Give your answer in hours.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick

Which situation is an example of an observational study?