How do u find tip amount from a bill of $67.51 and a tip of 20%

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. ?

Ineed me i stuck and i don’t want to get it wrong

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?