You travel 5 miles downstream in a kayak at a speed of r miles per hour. You turn around and travel 6 miles upstream at a speed of 0.75r miles per hour. Finally, you turn around and return to your original starting point at a speed of r+1 miles per hour a. Write a model in simplifies form for the total time t (in hours) of the trip.
b. How long does your trip take when r is 5 miles per hour?

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Ithink if ur looking for a ratio it would be 12: 3