On monday on Monday the water was shut off 3 times for 1/4 hours 2/3 hours and 1 3/4 hours what was the total number of hours the water was shut off

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.