The accident happened when Farhan, 21, was taking his sister Rafat, 17, and her friend Kajal, 17, to the college for their examination.
As the bike was taking a turn, a speeding truck hit them. Farhan and Kajal were killed on the spot while Rafat has been admitted to a medical facility in a critical condition.
Eyewitnesses said that the bike was stuck under the wheels of the truck and the victims were dragged for a few metres. The truck driver fled the spot and police are on the lookout for him.
The bodies have been sent for post-mortem.