Question

A canoe travels 5 miles downstream at rate r, and then 5 miles back upstream at

70% of its downstream rate. Write and simplify a rational expression for the total
time of the trip.

Answer 1

See below

Explanation:

distance / rate = time

d/r + d/(.7r) = total time

5 /r + 5 /(.7r) = time

35/7r + 50/7r = time

85/7r = time