What is the answer to this i don't know it and i am lost and confused can u me

27 is what percent of 108? 27 is % of 108

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5