Mountain bicycle has 26 in tires makes a trip 480 miles. Typical gearing for most bicycles ranges from 30 to 50 teeth on the chain wheel and 12 to 30 teeth on the rear cog. Find how many more revolutions of the pedals the mountain biker will make during 480 miles trip using average pedaling time 0f 85% of the trip and 42tooth chain wheel and 21 tooth rear cog