Question Summary:
Is it permissible to pray two salah in single time?

Question Detail:

Is it permissable to pray 2 salah in single time? My question is based on the below Q & A taken from a website. request you to kindly clear this doubt. The underlined matter.
Question: A group [of people] offered some of [the] obligatory prayers before their appointed time; having checked the [prayer] timetable, it is apparent they prayed a number of minutes before [the appointed time]?
Response: Yes, if they are sure they prayed [the obligatory prayer] before the appointed time, then they must repeat the prayer; that is because Allaah only accepts the [obligatory] prayer when it is done at its appointed time:{Verily, the prayer is enjoined on the believers at fixed hours}, Soorah an-Nisaa., Aayah 103
So it is not permissible to pray [the obligatory prayer] before its appointed time, except in a situation where he is combining the prayers; so if he combined the second prayer along with the first – then there is no harm in doing that [such that he combines the ‘Asr prayer with the Zhuhr prayer at the time of the Zhuhr prayer, or the ‘Ishaa prayer with the Maghrib prayer at the time of the Maghrib prayer]. That is because when combining two prayers – as per legislation, the time of the two prayers becomes one. As for [offering] the prayer before its appointed time – whether doing so was noticed after checking the approved Umm al-Qura [prayer] timetable or being informed by trustworthy [Muslims] that his prayer was not offered at its appointed time – then [in this case] he is required to repeat the prayer because it is [legally] considered incorrect.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
According to the Hanafi Mazhab (school of thought), every salah must be performed at its appointed time, whether one is a muqeem (non traveller) or a musafir (traveller).[1][2][3][4]⁵⁶⁷
However, in the case of a traveller, he may delay the Zohar salah till before the Asar salah time. After having performed the Zohar salah, he may perform the Asar salah shortly thereafter. Likewise, a traveller may delay the Magrib salah till before Isha and shortly thereafter perform the Isha salah. This is regarded as apparent joining of salah (Jama Sooriy), as every salah is performed in its appropriate time.⁸
The actual joining of two salah in one time is permissible according to other mazahib (schools of thought) as explained in their mazahib. ⁹
However, every adherent of a Mazhab should abide by the rulings of his Mazhab while respecting the rulings of other Mazahib. The website you referred to is probably for adherents of another Mazhab for example the Shafi mazhab or for the Ghair Muqalideen (people who “incorrectly” do not adhere to a mazhab). If you are a Hanafi, you are bound to follow the rulings of the Hanafi Mazhab only and refer only to Hanafi jurists for guidance.
 
And Allah Ta’āla Knows Best
Imran Cyclewala
Student Darul Iftaa
Zambia. 
Checked and Approved by,
Mufti Ebrahim Desai.