Answer:
The speed of the current is 5 miles per hour.
Step-by-step explanation:
Given, Joy kayaked up the river and then back in a total time of 6 hours.
The trip was 4 miles each way.
The current was difficult.
Let the speed of current be 'a' miles per hour
If joy kayaked at a speed of 5 mph in still water, we have to find what is the speed of the current?
Now, we know that,
distance = speed x time
So,
Then, total time = time for up stream + time for down stream
Now, let us use quadratic formula, to find a value.
Then,
we can neglect – ve values of speed.
A = 5.71