P can complete a piece of work in thrice the time taken to complete Q and R together. If P and Q together can complete the work in 9 3/5 days and R alone complete in 16 days, then find the no of days taken to complete the work by P alone?

A can do a piece of work in 18 days and B in 36 days. If they work together for 9 days, then what percentage of work will be left?

Amar can do a piece of work in 30 days and Raman can do the same work in 15 days. If both work together, then what percent of the total work will be completed in 4 days?

P can do $${1\over 2} $$ of a work in 10 days and Q can do $${1\over 5}$$of the same work in 4 days. In how many days can both finish the work, working together?

Aman and Raman together can complete a work in 30 days, Raman and Manan can complete the same work in 36 days and Manan and Aman can complete the same work in 45 days. In how many days can all three together complete the work?

The rates of working of A and B are in the ratio of 2 : 3. The number of days taken by each of them to finish the work is in the ratio : 

P, Q and R gets a total wage of Rs.3600 if they work together. P and Q gets a total wage of Rs. 2800 if they work together and P alone gets Rs.1600. Find the efficiency ratio of P, Q and R  

A and B start moving from places X and Y and Y to X, respectively, at the same time on the same day. After crossing each other, A and B take $$5{4\over 9}$$ hours and 9 hours, respectively, to reach their respective destinations. If the speed of A is 33 km/h, then the speed (in km/h) of B is: