Question
Each of three pumps A, B, C can pump water either into, or out of, a swimming pool. Pump A can fill the pool in 6 hours, while pumpp B works twice as fast. Pump C however takes one third more time than pump A to fill the pool.
1. All three pumps together pumping in water will fill the pool in ____ hours.
2. With pump B pumping out water, and both pumps A and C pumping in, the pool wil empty in _____ hours.
1. All three pumps together pumping in water will fill the pool in ____ hours.
2. With pump B pumping out water, and both pumps A and C pumping in, the pool wil empty in _____ hours.
Answers
1/6 + 1/3 + 1/(4/3*6) = 5/8
So, they will take 8/5 hr or 1 hr 36 min.
Now just figure
1/3 - (1/6 + 1/8) = 1/24
so it takes 24 hrs to empty the pool
So, they will take 8/5 hr or 1 hr 36 min.
Now just figure
1/3 - (1/6 + 1/8) = 1/24
so it takes 24 hrs to empty the pool
The speed of a boat in still water is 20 mph. It travels 24 mi upstream and 24 mi downstream in a total time of 10 hr. what is the speed if the current?
Related Questions
The water supply in a town depends entirely on two pumps. A and B. The probability of pump A fillin...
it takes 3 hours for ten pumps to pump 40000l of water ino a dam. how long will it take nine pumps t...
a water pump of 1.2kw rating pumps 480kg of water into overhead tank at the height of 5m at 30second...
it takes 3 hours for 10 pumps to pump 40000 liters of water into a farm dam .
How long will it take...