Salary from more than on employer

A person is working with 3 Employers on diffrent arrengements:

Employer 1 - Working Hours Morning 7.00 to 10.00 only  - Income Rs. 10000 p.m.

Employer 2 - 3 Days in Week (Full Day ) M W F - Income Rs. 15000 p.m.

Employer 3 - 3 Days in Week (Full Day) T T S - Income Rs. 12000 p.m.

Whether a person can receive salary from more than one employer? What is the position under Income Tax Act based on any decided case law?