GMAT Test Prep: DS-32323539 GMAT Data Sufficiency

On a certain nonstop trip, Marta averaged x miles per hour for 2 hours and y miles per hour for the remaining 3 hours. What was her average speed, in miles per hour, for the entire trip?

(1) 2x + 3y = 280

(2) y = x + 10
Select one of the following answer choices