Home  / Mathematics  / Aptitude  / Time & Work
Time & Work
Time, Distance and Speed

If C can complete a work in 20 days and D can complete it in 30 days, how long will it take for them to finish the work together?

Answer: B. 15 days
C's rate is 1/20 and D's is 1/30. Together, they work at a rate of 1/20 + 1/30 = 1/12. Therefore, they will complete the work in 12 days.
Posted in:  Time & Work -  Aptitude -  Mathematics