Suppose you hike 3 miles from the campgrounds to the lake at a rate of X miles per hour. On your way back from the lake to the campgrounds, your rate was 1 mile per hour faster. If it took you 2.5 hours for the complete round trip, which equation could be used to determine your rate?
A B C or D?
timed question

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.