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?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.