A: First:
It is obligatory to perform Salah in the nearest Masjid to your workplace, (Part No. 6; Page No. 180) as long as you are able to do so and you can hear the Adhan, because congregational Salah in the Masjid is obligatory for men and it is not permissible to stop offering it there. As for women, it is not prescribed for them at all to give the Adhan or Iqamah.
Second:
Nowadays, there are accurate instruments to tell the time. If you cannot hear the Adhan for some reason, it is your obligation in this circumstance to depend upon a clock and go to the Masjid at the due time of the Salah.
Third:
Giving the Adhan is one of the collective obligations. If the Mu’adhin (caller to Prayer) has said the Adhan in the Masjid and the Salah has ended and another group comes to perform the Salah, it is prescribed for them to just say the Iqamah; they do not have to say the Adhan.
Fourth:
If a person lives in a city, it is sufficient for them to say the Iqamah for every Salah they miss. However, if they live in the desert or a place where no one gives the Adhan, they should give the Adhan once and say the Iqamah for every Salah.
Fifth:
If a woman becomes ritually pure before the 40 days of her postpartum period has ended, she should perform Ghusl (ritual bath following major ritual impurity), perform Salah and Sawm, and it is permissible for her husband to have sexual intercourse with her, because she is considered to be ritually pure after the postpartum bleeding stops.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.