In the first accident, a tractor hit a motorcycle in the Bisrakh police area last night, killing Dasrath and his wife Chandrakant.
Police said while Chandrakant died on the spot, her husband was rushed to a hospital, where he succumbed to his injuries.
In another accident, a motorist, Niranjan, was today killed after being hit by a tractor on Service Road of Noida Expressway near Badoli.
In the third accident in Kasna area near the Jaypee crossing this evening, a motorcyclist, Gaurav, was seriously injured after an unknown vehicle hit his bike, police said.