To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively.  The time in minutes that the three pipes together will take to fill the cistern is:__________?

Related Mcqs:

B can work 3 times faster than A. They work together on a task and complete it in a day. How long does it take for B alone to complete the task?

A. 32 hours B. 48 hours C. 3 days D. 4 days...

A alone can finish a work in 10 days and B alone can do it in 15 days. If they work together and finish, then out of a total wages of Rs.75. A will get:___________?

A. 35 Rs. B. 40 Rs. C. 45 Rs. D. None of these...

A can lay a railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in_________?

A. 4 B. 9.6 C. 9 D. 10...

Twelve men can do a work in twenty days while twenty women can finish the same work in sixteen days. Find the ratio between the capacity of a man and a woman.

A. 3:4 B. 5:4 C. 4:3 D. 5:3...

Assume that 20 cows and 40 goats can be kept for 10 days for Rs.460. If the cost of keeping 5 goats is the same as the cost of keeping 1 cow, what will be the cost for keeping 50 cows and 30 goats for 12 days?

A. Rs.1104 B. Rs.1000 C. Rs.934 D. Rs.1210...