Help plz and explain it to me thank you

Combined megan and kelly worked 60 hours. kelly worked twice as many hours as megan. how many hours did they each worked?

How do i do this? i don’t understand

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable