Making Up Fajr
If go to Mosque Imam has started Farz prayer, should we pray Farz then pray Sunnah , as some people do not pray Sunnah after Farz until after sunrise, some pray Sunnah while Farz are going on. Also please tell me how much time before sunrise and sunset van we pray Namaz(including any voluntary Namaz), 5 minutes, 10 minutes? At the timr of sunrise or sunset is recitation of Qur’an and making Dua allowed at time of sunrise/sunset?