Bob is traveling downstream at his typical speed with a current of 3 miles per hour....

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Bob is traveling downstream at his typical speed with a current of 3 miles per hour. After 12 miles, the river joins with another and the current increases to 5 miles per hour. If the entire 40 mile trip took 3 hours, what is Bob's typical speed? Bob is traveling downstream at his typical speed with a current of 3 miles per hour. After 12 miles, the river joins with another and the current increases to 5 miles per hour. If the entire 40 mile trip took 3 hours, what is Bob's typical speed?