Prayers of a traveler (Musafir)

A traveler should reduce the Rak’ats in Zuhr, ‘Asr and ‘Isha prayers, that is, he should perform two Rak’ats instead of four, subject to the following eight conditions:

The first condition – That his journey should not be less than 8 Farsakh. A Farsakh in Shariah is 12000 Ziraa’ (it’s a unit of measuring the length), and it is mentioned that it is approximately 51/2 (5.5) kilometers. (So, 8 Farsakh is approx. 44 km)