A water well drilling rig has dug to a height of -60 feet after one full day of continuous use. If the rig has been running constantly and is currently at a height of -147.5 feet, for how long has the rig been running?

If the rig has been running constantly and is currently at a height of -147.5 feet, for how long has the rig been running?

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.