First you should subtract the whole numbers.
254-128=126
Now subtract the fractions.
Multiply 7/50 by two and get 14/100 take a whole number and make it a fraction. so now you have 114/100. Subtract 53/100.
114/100-53/100=61/100
Since we stole one from the whole number it means there is 125 instead of 126.
Put it all together, they have 125 61/100 miles to drive.
Hope this helps!!