Both offices are open 09:00–15:45 Kathmandu time — 6.8 hours together.
09:00 you → 11:15 Hong Kong
10:00 you → 12:15 Hong Kong
11:00 you → 13:15 Hong Kong
09:00→11:15Hong Kong is at work
10:00→12:15Hong Kong is at work
11:00→13:15Hong Kong is at work
12:00→14:15Hong Kong is at work
13:00→15:15Hong Kong is at work
14:00→16:15Hong Kong is at work
15:00→17:15Hong Kong is at work
16:00→18:15outside Hong Kong working hours
17:00→19:15outside Hong Kong working hours
Working hours assumed 09:00–18:00 local. Offsets include daylight saving where it applies, so this shifts through the year.