Joe can paint a wall by himself in 150 minutes. suppose steve can paint a wall 4 times the rate as joe. how long will it take both steve and joe to paint the same wall?

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters