Rae averages 1.4 miles per hour when hiking downhill on a mountain trail and 0.8 miles per hour on the return trip, hiking uphill. Use the formula Let d = the one-way distance.
___ is the numerator of the simplified expression of the total time.
___ is the denominator of the simplified expression of the total time.

a.) 11.2
b.) 28
c.) 55d
d.) d
e.) 22d
f.) 22