Fast please!
Extracted text: A group of hikers from Tulsa hiked down into the Grand Canyon in 3 hours and 30 minutes. Coming back up on a trail that was 4 miles shorter, they hiked 2 mph slower than in going down and took them one hour longer. What was the rate in going up? Select one: O a. 6 mph O b. 3 mph O c. 4 mph O d. 5 mph