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