Question

P can do a job in 15 days. In how many days can P and Q together complete the job if Q is twice as fast as P ?​

Answer 1

Step-by-step explanation:

It is given that Q is twice as fast as P. Q can do a job in 15/2 days. No. of days taken by P and Q to complete the job = 1/(1/15+2/15) =1/(3/15) = 5 days.