To answer the question presented above, the conversion factor for km to feet is 1 kilometers is equal to 3280.84 feet. From the given, (12 km) x (3280.84 ft / 1 km) = 39370.08 feet Thus, Joe traveled an approximate distance of 39370 feet.
1 km = 3280.84 feet. One can get the conversion factor from kilometer to feet from the above deduction. To answer the second part of this question, the above conversion is definitely needed, 12 kilometers = 3280.84 x 12 feet = 39370.08 feet. So from the above deduction, it can be concluded that Joe traveled for a distance of 39370 feet.
They are both unknown variables that when put into the right equation can be solved. ( I hope it helped a little you could just put their both unknown variables )
