Two-number recall: Normal week equals 48 hours; with overtime the ceiling equals 60 hours.
Build-up: The Factories Act fixes the standard work-week at 48 hours. It then allows overtime of about 2 hours each working day, which over the week brings the total close to 60 hours.
Eliminate distractors: 48 is only the base limit without overtime, so it is too low for the question asked. 50 is not a defined statutory figure. 100 is far above any legal limit. Only 60 fits the with-overtime maximum.
So the answer is 60 hours. Ref: Park PSM, 24e, p.852.