If you need to find the hypotenuse, then square the two sides and add them together then square root that answer to get the hypotenuse. If you need to find a side then take the hypotenuse and other side and square them then subtract the side by the hypotenuse and then square root that answer.
She started at 6:35 p.m, because minus 10 from the 7:10, you just have 7 now right? And she only has 25 min left. then minus 25 from 60 to get your answer. it is 6 35 pm.