A person goes from home to the office at 80% of his usual speed. After a 2-hour rest, he returns with the usual speed. If he covers 2000 km of distance during the whole journey, it takes 52 hours to complete it. Find the speed at which he goes to the office.
1
10 m/s
2
11 m/s
3
12 m/s
4
13 m/s