Question 1:
translate the job into man*hour, you get 60 mh;
between 11am and 5pm, with 6 men, 36mh done, and there's 24mh left.
in the next hour, 7mh will be done, the one after next, 8mh, and the one after next 9mh.. so it will take 3 additional hours to finish the job.
.'. 7 + 8 + 9 = 24 mh
Thus the answer is E.