Suppose a diver is at the surface of water. Construct an equation that discuses how fast the diver is diving and what depth of the diver and the time the diver will take to reach a certain depth. Explain your equation.

Answer 1

Suppose the diver can descend at 1.5 m/s
and the river is 18 m deep

depth = -1.5t + 18, where depth is the distance to the bottom in metres, and t is the number of seconds

Your equation might differ, depending on your definitions. Look carefully
how I defined "depth",