Houston is 11.75 hours behind Kathmandu
There is no standard 8-to-6 overlap. Someone joins early or late.
Kathmandu and Houston live on different parts of the day. With 11.75 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. Note that Houston follows daylight saving while Kathmandu stays put, so the times above drift by an hour seasonally.