A speed ramp at an airport is a moving conveyor belt on which you can either stand or walk. It is intended to get you from place to place more quickly. Suppose a speed ramp is 124 m long. When you walk at a comfortable speed on the ground, you cover this distance in 76.4 s. When you walk on the speed ramp at this same comfortable speed, you cover this distance in 39.5 s. Determine the speed at which the speed ramp is moving relative to the ground.
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