Cathy borrows $3280 at 0.3% simple interest per month. When Cathy pays the loan back 9 years later what is the total amount that
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Answer:
The speed of boat in still water is 14 miles per hour.
The speed of current is 6 miles per hour.
Step-by-step explanation:
Let v represent the speed of boat in still water and c represent speed of current.
We have been given that a boat on a river travels downstream between two points, 20 miles apart, in one hour.
The speed of boat downstream would speed of boat in still water plus speed of current that is .
The return trip against the current takes 2 1/ 2 hours. The speed of boat against current would speed of boat in still water minus speed of current that is .
Substituting our given values, we will get:
Adding both equations, we will get:
Therefore, the speed of boat in still water is 14 miles per hour.
To find the speed of the current in the river, we will substitute in equation (1) as:
Therefore, the speed of current is 6 miles per hour.