Hong Kong is 2.5 hours ahead of Delhi
Best overlap: 8:30 AM to 3:30 PM in Delhi is 11:00 AM to 6:00 PM in Hong Kong.
Your shared working hours run 8:30 AM to 3:30 PM in Delhi (11:00 AM to 6:00 PM in Hong Kong). The 2.5-hour gap barely gets in the way — you've got 7 hours of overlap, so pick whatever time fits the agenda.