If Marvin wants to complete 1/2 of his test in 2/3 of an hour. To get 1/2 to 1 you multiply it by 2. (1/2x2=1) You would then multiply 2/3 of an hour by 2 to get 4/3 of an hour to complete the whole test(2/3x2=4/3). 4/3 of an hour is equivalent to 1 hour and 20 minutes or 1 and 1/3 of an hour.
Marvin is trying to finish 1/2 of his test every 2/3 hour. How many hours will it take Marvin to complete his whole test