Which equation is equivalent to 2^3r = 10?

How do i solve uniform motion problems?

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air