I have one doubt
whether we have to pray qasr namaz or full namaz in Mina Arafat and muzdaffah

we are in Makkah for 11 days and our stay in Makkah is 2-3 kms only

A traveller can offer full prayers in Masjidul Haram and Masjidul Nabi and Masjid of Kufa, and even in the entire cities of Makkah, Madina and Kufa. He can also offer full prayers in the Haram of Imam Husayn (A.S.), upto the distance of 25 armlengths from the sacred tomb.