Stacy rowed across the lake with her friend rainey (in the same boat) at a rate of 3 mph. rainey then rowed back at a rate of 2 mph. if the lake is 6 miles across, how long did it take them to complete their trip?

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30