It is 12.5 inches. To get this you have to use proportion and rate. So we already know that the turtle can move 5 inches in 4 minutes. Divide 4 on each side, so it would 5/4 inches and 4/4 minutes. So it would be 1.35 inches would equal 1 minute. Then multiply each side by 10 because we want to know how many inches the turtle would walk if it walked for 10 minutes. So then, it would give us 12.5 inches in 10 minutes. (I had changed the fraction into a decimal.) I hope this helps. :)