Ottawa is 11 hours behind Dhaka
There is no standard 8-to-6 overlap. Someone joins early or late.
Dhaka and Ottawa live on different parts of the day. With 11 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. Daylight saving complicates things slightly: Ottawa observes it, Dhaka doesn't, so the difference flexes by an hour part of the year.