Together, bob and tom take 2 hours to get the yard work done. if bob works alone, it takes him 6 hours. how long would it take tom to do all of the yard work, working alone

Plzz ! if you were constructing a triangular frame, and you had wood in the length of 4 inches, 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/show your work: