In 1 full revolution, the bike will travel 42 inches because the diameter of the tire is 21 inches. Any point on the tire will have to go through a whole revolution to be back at the original point which means 21 inches times 2.
So the bike travels 42 inches in 1 revolution then in 50 revolutions it will travel 2100 inches (42 times 50). Now if your convert 2100 inches to feet, you get 175 feet.
The unknown is the distance in kilometres The given is the distance in miles=140 miles 1 mile=1.6093km 140 miles=? 140/1*1.6093km=225.302km Therefore the 140 miles in km is 225.302km
