D) You can check your answer by taking what x equals and plugging back into the original formula of $355+$18x=$514+$15x. Then solve making sure the left side equals the right side.
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
