How does the prophet of Islam respond to 'salat' he receives?

This is not a question we have an answer for.

After death,you basically go to a completely different life.. which could not follow our mind-limited physical laws..

It's all from the knowledge of 'ghayb which we shouldn't put our noses in.

Just like asking " How can Jibreel have 600 wings ?" or " How can Allah talk to us all on the day of judgment simultaneously?"

This is a red line which you shouldnt cross.