Question

John threw a rock into a lake from a bridge 124 feet above the river surface the rock sinks 81 feet below the river surface. What is the distance between the elevations

Answer 1

The distance between the elevations is the sum of the distance above the river surface and the distance below the river surface.

Distance above river surface: 124 feet
Distance below river surface: 81 feet

Therefore, the distance between the elevations is 124 feet + 81 feet = 205 feet.