Today, a bicycle rider rode her bike 5 1/2 miles. Yesterday, she rode 6 1/4 miles. The difference in length between the two rides is what fraction of the longer ride?

The question is looking for the difference divided by the longer ride. the longer ride is 6 1/4 miles, so now we need to find the difference. in order to do this we take the larger distance and subtract the smaller distance, so we would take 6.25 (i like decimals more) - 5.5 and we get. 75 or 3/4 of a mile. now we put. 75 over 6.25 and simplify. 125 or 1/8