Question

how did the Djinn know the horse was complaining against the camel?

Answer 1

HERE IS YOUR ANSWER

The jinn kenw that the horse was complaining because he was the incharge of all the desert and knew about everything hopping in the relation to his desert.

HOPE THIS HELPS.....

Answer 2

because he was the in change of the desert and knew about everything hopping in the relation to his desert.