The incident took place near the Chembur Camp bus stop on Wednesday morning.
Krishna Boyanna (18) and his three friends, minors, wanted to take the taxi in which the victim Surendra Singh and two others were travelling, the official said.
Mr Singh and his companions were about to get down but were taking their time to pay the fare. Irked, the accused asked them to get down immediately, the official said.
This led to a spat, and the accused allegedly hit the other group with paver blocks, the official said.
A case of murder was registered at the Chembur police station, said DCP (Zone VI) Shahaji Umap.
While Boyanna was arrested and sent to police custody till May 14, the three minors were sent to a children's home, he said.
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