*** i will give you a medal ***
The speed of the current in a river is 6 mph. A ferry operator who works that part of the river is looking to buy a new boat for his business. Every day, his route takes him 22.5 miles against the current and back to his dock, and he needs to make this trip in a total of 9 hours. He has a boat in mind, but he can only test it on a lake where there is no current. How fast must the boat go on the lake in order for it to serve the ferry operator’s needs?

Question

*** i will give you a medal ***
The speed of the current in a river is 6 mph.  A ferry operator who works that part of the river is looking to buy a new boat for his business. Every day, his route takes him 22.5 miles against the current and back to his dock, and he needs to make this trip in a total of 9 hours. He has a boat in mind, but he can only test it on a lake where there is no current. How fast must the boat go on the lake in order for it to serve the ferry operator’s needs?

tkhunny · Answer

Distance = Rate * Time

S = Speed of Boat in Still Water.

Build the equation twice!

anonymous · Answer

what???

tkhunny · Answer

You need to know how to create (define) variables.  If you respond with such surprise to the definition of a variable, I'm not sure we can continue this conversation.  Let's see...

Please define a variable for the TIME of the trip UP the river.  Just DEFINE it.