Isosceles triangles are triangles in which two sides and angles are equal to each other. Equilateral triangles are triangles in which all of the sides are the same.
The answer you are looking for is 40 hours. they gave you the answer in the statement above when they said he gets time-and-a-half for any hours beyond 40. So he only worked 40 regular pay hours and got 4 hours overtime for time-and-a-half.
