7 days 8 hours 20 minutes

- 4 days 10 hours 30 minutes

F 2 days 21 hours

50 minutes

G 3 days 2 hours

10 minutes

H 7 days 8 hours

20 minutes

J 11 days 8 hours

50 minutes

K none of these

The Answer is F.

20min - 30min is - 10 so you can take it out of 8h which will leave you with 7h and 50 minutes then

7h and 50 min minus 10 h is - 3 h and 50 minutes take it out of the 7 day's which leaves you with 6days and 24 h minus 3 h that it 6days and 21 h and 50 minutes in total and minus the ram aiming 4 days which will be

2days 21 hours 50 minutes and that gives you the answer F