In science class, Antonio and Anna were measuring the approximate speed of a marble as it exits from an 8-foot-long ramp. They discovered that it took 2.1 seconds for the marble to
travel 12.5 feet from the end of the ramp. If r = 0, where d is distance in feet and t is time
t
in seconds, approximately how fast was the marble traveling as it exited from the ramp to
the nearest hundredth of a second?