Hi,

I thought the answer was A) but actually correct answer is D)

For 2), why it is okay although we dont know the average rate for the last half??


. How many miles long is the route from Houghton to Callahan?
(1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 11 hours to travel the first half of the route at an average rate of 25 miles per hour.