salaah time

Q: When does the time of Maghrib Salaah commence and terminate?

Q: I want to know that can a woman offer Salaah before the congregational Salaah in the Musjid or does she have to wait for the congregational Salaah to be done in the Musjid before she performs her Salaah? Similarly what is the ruling for woman's zuhr Salaah on Friday?

Q: If tayammum is done for Zuhr Salaah, can we read Asr, Maghrib and Esha Salaah with the same tayammum?

Q: I want to ask that I live in Karachi and the asar time in my city starts from 3.27pm and the adhan for prayer is being called off by 4.15pm but I am a student. I have to go to coaching to take my classes and my class starts from 4.15 to 5.00 and there is a 5 minute break but in that 5 minute break there is such a rush of people so I am not able to pray my Asr Salaah and the next class begins from 5 - 5.45 but at 5.45 it is time for Maghrib. Can I pray before adhan is called?

Q: I am taking an online aalimah course and because of time differences, South African time goes from before maghrib 6:00 to 8:30 after esha has already set in. The asaatizah have told us that we should leave for salaah and catch up with the missed portion of the lesson later.i.e. We definitely shouldn't miss our Salaah for classes. Our first lesson completes at 7:00 or 6:45 depending on subject and day. Can I wait for the first lesson to complete and then read my maghrib Salaah before the next subject or should I immediately leave the lesson and catch up later?