Qasar Salaah and Full Salaah

Q: If someone goes for studies to a place which is around 400 km away from her place of residence, then when she comes back home she will read qasr namaz or normal namaz?

Q: We had a tashkeel of 17 days in Karachi. When we reached the railway station for Lahore we offered four rakaats of asr before the train left from the station. Is it done or we should perform two rakaats?

Q: In beheshti zewar, in the chapter of salaah on a journey, mention is made that if the azaan from one place cannot be heard in another place, then they are regarded as two places, for the purpose of the musafir if he spends 10 days in each place, he would still be a musafir. Does this still apply today when determining where are boundaries? Or does one look at the municipal boundaries between suburbs and localities?

Q: I though I was in Qasar and performd some salaah (Not with Jamaat) 2 Rakats of asr, 3 of magrib , 2 of isha. Later I came to know that I am not in qasar. Is my prayer valid?

Q: I travelled to the city from a village which is 220 km away. I will stay here for two months. I thought I was in Qasar and offered Salaah with Jamaat in the musjid. Are my Salaahs valid?

Q: A musaafir became a muqeem in Durban because he intended to stay for 30 days. However, after 20 days, he travels to Port Shepstone, for one day only, returning the same day to Durban. Will this person read qasar for the remaining 10 days or the full salaah?

Q:

1. If someone intends traveling to a place more than 55 miles (i.e. 88 km) from his hometown but intends staying at his destination for more than 15 days, will he do qasr while traveling to that place?

2. If a person intends going to a place more than 55 miles (i.e. 88 km) from his hometown. After reaching he intends to stay for 15 days. Later on he changes his mind and intends to stay for 2 days. Will he be musafir or muqeem?

Q: Most of the time I am out of my home town more than 100kms. When I am back home for 10 days, in this 10 days I must make my namaz qasar or the normal namaaz?

Q: When traveling for 2 nights and you pray as a musafir then you realise that your staying longer than 16 days. Do you have repeat the namaaz you missed during the first two days?

Q: A person travels to a place that is safar distance and intends staying there for 10 days. After 8 days the person changes his intention and intends staying for another 8 days. Will the person read full namaaz or will he be a musaafir? What about the salaah that was performed in the first 8 days? Will he have to repeat the Salaah?