In an office, a typing work can be finished by Monika in 6 hours, Anita in 8 hours and Manju in 5 hours if they work alone. How much time (in hours) will they take if they work together?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e.
Given that
A typing work can be finished by Monika in 6 hours
The same typing work can be finished by Anita in 8 hours
The same typing work can be finished by Manju in 5 hours
Total work = LCM (6, 8, 5) = 120
The efficiency of Monika = 120/6 = 20
The efficiency of Anita = 120/8 = 15
The efficiency of Manju = 120/5 = 24
Hence, If they work together, the time taken to finish the same work = 120/59 =