The Wall

Riddle: Ali and Morad build a wall in 2 hours, Ali and Hichem build a wall in 3 hours, Morad and Hichem build a wall in 4 hours. How much time will they take to build a wall if they worked together?

Answer:

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Source: https://www.riddles.com/9434

Ali and Morad build a wall in 2 hours, Ali and Hichem build a wall in 3 hours, Morad and Hichem build a wall in 4 hours. How much time will they take to build a wall if they worked together? — The wall by Amine Benderdour v1.

Riddle: Ali and Morad build a wall in 2 hours, Ali and Hichem build a wall in 3 hours, Morad and Hichem build a wall in 4 hours. How much time will they take to build a wall if they worked together? Answer: I don't know — by Amine Benderdour v2.