Montreal is 10.75 hours behind Kathmandu
There is no standard 8-to-6 overlap. Someone joins early or late.
Kathmandu and Montreal are 10.75 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 Kathmandu and Montreal so the burden doesn't fall on one team. Remember that Montreal shifts for daylight saving and Kathmandu doesn't, so recalculate the overlap after each clock change.