Because the boat travels the distance twice as fast when going 3 three miles/hour faster the original speed must be 3 miles/hour. so the distance upstream would be 21 miles/hour.
Answer:
Alright well solve for f by cross multiplying
Exact form: f = 57/4
Decimal form: f = 14.25 Hope this helps have a nice day :)
Step-by-step explanation: