Bob can row 11 mph in still water. The total time to travel downstream and return upstream to the starting point is 4.4 hours. If the total distance downstream and back is 34 miles, determine the speed of the river (current speed).

Renee hiked for 6 3/4 miles. after resting, renee hiked back along the same route for 5 1/4 miles. how many more miles does renee need to hike to return to the place where she started? represent your answer as a simplified mixed number, if necessary.