Delhi is 3.5 hours ahead of Bucharest
Best overlap: 8:30 AM to 2:30 PM in Bucharest is 12:00 PM to 6:00 PM in Delhi.
Shoot for 8:30 AM to 2:30 PM in Bucharest; your Delhi colleagues will see that as 12:00 PM to 6:00 PM. That's a roomy 6 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Note that Bucharest follows daylight saving while Delhi stays put, so the times above drift by an hour seasonally.