Additional Sessions Judge S C Upadhyaya also imposed a fine of Rs 10,000 each on Sanju Dhimer, Manish Prajapati and Pappu Prajapati in the verdict announced yesterday.
The accused gang-raped the victim after kidnapping her on December 16, said Superintendent of Police Lalit Shakyawar.
Police completed the probe within 13 days and the case was submitted for trial which got over in 58 days.