Washington, D.C. is 10 hours behind Dhaka
There is no standard 8-to-6 overlap. Someone joins early or late.
Dhaka and Washington, D.C. are 10 hours apart, and that gap is wide enough that their normal 9-to-5 workdays never quite touch. If you meet regularly, fix one off-hours slot and rotate it between Dhaka and Washington, D.C. so the burden doesn't fall on one team. Remember that Washington, D.C. shifts for daylight saving and Dhaka doesn't, so recalculate the overlap after each clock change.