The blue lake trail is 11 3/8 miles long. Gemma has hiked 2 1/2 miles each hour for 3 hours. How far is she from the end of the trail?

In the question it is given that the length of the blue lake trail is 11 3/8 miles. In the question it is also given that Gemma has hiked for a total time of 3 hours and each hour she has hiked 2 1/2 miles.

Now coming to solving the problem we get:

Total length of blue lake trail = 11 3/8 miles

= 91/8 miles

Distance hiked by Gemma in 1 hour = 2 1/2 miles

= 5/2 miles

Then the total distance hiked by Gemma in 3 hours = (5/2) * 3

= 15/2 miles

The distance left to cover the full trail = (91/8) - (15/2) miles

= (91 - 60) / 8 miles

= 31/8 miles

= 3 7/8 miles.

So Gemma is 31/8 miles or 3 7/8 miles from the end of the trail.