The car was on its way to Shuklaganj when it was hit by the truck while taking the turn on the main road, from an unauthorised cut.
Lalit (24), Anil Pandey (20) and six-month-old Avni died in the accident, police said.
The four injured were rushed to the district hospital from where two of the seriously injured were referred to Kanpur, police said, adding that bodies have been sent for post mortem examination.
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