Can somebody please help with our first extra-European flight? We're going PRG-FRA-DEL-JAI in February 2015 and on the return journey JAI-BOM-MUC-PRG there is only 2:35 hours at Mumbai to transfer from 9W-454 to LH-765 (terminal 1B to 2 according to the tickets). After what I've read about the airport I don't think it can be made?

Do we need to collect & check in again our bags or do they go direct? Also what happens if we miss the connecting flight? Do we automatically travel on the next one for no extra charge? All the flights have been booked together under one reference code but on the confirmation the Indian domestic and the international segments have their separate check in numbers, too