In 1 1/2 hours, sebastian can walk 4 1/2 miles.
what is his average speed in hours per mile?

The average speed of Sebastian is 3 miles per hour.

Solution:

Given, In hours, Sebastian can walk 4 1/2 miles.  

we have to find What is his average speed in hours per mile

We know that, average speed

In our problem, total distance travelled =

Now, average speed of Sebastian

Hence, the average speed of Sebastian is 3 miles per hour.

its an acute right triangle

step-by-step explanation:

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