Ajet plane, flying 105 mph faster than a propeller plane, travels 4550 miles in 3 hours less time than the propeller plane takes to fly the same distance. how fast does each plane fly?

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm. it decreased by the same amount each year. what was the change in grandpa ernie's height each year