If one pipe A can fill a tank in 20 minutes, then 5 pipes, each of 20% efficiency of A, can fill the tank in:

Twenty women together can complete a piece of work in 16 days, 16 men together can complete the same work in 15 days. Th…

Two typist of varying skills can do a job in 6 minutes if they work together. If the first typist typed alone for 4 minu…

A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days…

If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complet…

A and B together can do a job in 2 days; B and C can do it in 4 days; A and C in $${\text{2}}\frac{2}{5}$$ days. The nu…

40 men can complete a piece of work in 15 days. 20 more men joined them after 5 days they start doing work. How many day…

P and Q together can do a job in 6 days. Q and R can finish the same job in $$\frac{{60}}{7}$$ days. P started the work…