Can someone help me with my homework please?

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.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

Tell whether the two rates form a proportion