I am new to FT, and I got some questions towards my IB flights in July.

I will be travelling from Munich to BCN ( transit in MAD)

I will take
IB3539 arriving MAD at 15:00
IB2720 leaving MAD to BCN at 15:45

I would like to ask is 45minutes okay for transit ?
The tickets have been successfully issued. What can I do for this transit?

Thank you very much