Bob can row 12 mph in still water. The total time to travel downstream and return upstream to the starting point is 4 hours and 48 minutes. If the total distance downstream and back is 38 miles, determine the speed of the river (current speed).

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!