That triangle appears to be an isosceles which means there are two sides that are the same length which would make the the missing angles the same degree and a triangles angles added together should equal 180° so 45+45= 90 and 90+90=180
It will take him 1 hour and 30 minutes. (90 minutes)
Step-by-step explanation:
If he is running 1 mile in 10 minutes and he needs to run 9 miles the just multiply 9 by 10 to get 90 then simplify if you need to to get 1 hour and 30 minutes.
Hope this helped and have a great rest of your day.
