Aplane left on time at noon on monday. it arrived at its destination at 8: 16 pm the same day, which was 16 minutes late. on average, how many seconds did the plane fall behind every fifteen minutes?

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.