Question

P is twice as efficient as Q. Q takes 12 days to complete a job. If both of them work together, how much time will they take to complete the job?

• A. 6 days
• B. 5 days
• C. 4 days
• D. 3 days

Answer 1

Answer:

C. 4 days

$$Efficiency of P : Q =2 : 1</p><p style="color: rgb(0,0,0); margin-top: 2px; margin-bottom: 2px" data-pxy="true">$$Q takes 12 days to complete the work

Total work be$=12\times1=12$

Both of them working together efficiecncy be 3

$$Time required to complete the work $=\frac{12}{3}$

$=4days$