A bicyclist rides 20 miles against a wind and then returns the same distance with the wind. Her average speed during the return trip is 3 mph faster. If the total time of the trip is 10 hours, how fast did she ride against the wind

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking