The teenage girl, who works as domestic, was allegedly raped by them on pretext of job in a school on Sunday.
One of the accused a scrap dealer was known to the victim for more than a year.
"The accused, who owns a scrap shop in the market, saw the girl and told her that he can get her a job in a school. He then took her to the school," a senior police officer was quoted as saying by Times of India.
Their entry inside the school was facilitated by the school's security guard, who was known to the scrap dealer, the officer added.
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Duo fled when victim tried to raise an alarm. The victim narrated ordeal to her mother after returning home.
Later a complaint was filed in Jagatpuri police station and the victim was sent for medical examination. A case under IPC Section 376D and other sections of POCSO was registered.