SOLUTION: Bob can row 12 mph in still water. The total time to travel downstream and return upstream to the starting point is 2 hours and 40 minutes. If the total distance downstream and bac

Question 1143883: Bob can row 12 mph in still water. The total time to travel downstream and return upstream to the starting point is 2 hours and 40 minutes. If the total distance downstream and back is 30 miles, determine the speed of the river (current speed).
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!

WAY            SPEED         TIME             DISTANCE

DOWNSTR         12+c                            15

BACKUP          12-c                            15

TOTAL                                     30

Simplify and solve for c:

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