If 7 pipes can fill 1 drum with water in 6 hrs, how many hrs will it take 9 pipes to do the same?

Answer 1

(6*7)/9

Answer 2

Some people need to get a little common sense. How can 9 pipes take longer than 7 to fill a drum?

7 pipes put out 1/6 of a drum an hour so,
1 pipe puts out 1/7 of that, or 1/42nd of a drum per hour
9 pipes will put out 9/42, or 3/14ths of a drum per hour.
1 drum divided by 3/14 is 14/3 so that means 14/3 of an hour for 9 pipes to fill a drum, or 4 hours 40 minutes.
Or, you could have just multiplied 6 hours times 7/9 if you wanted to skip all the steps.

Answer 3

It should take 7/9 of 6 hours. 42/9 hours = 4 2/3hrs

The formula above is correct if more pipes are added to the same source, effectively reducing the pressure. If you add two more pipes from a different source, maintaining previous pressure, you don't need the formula.

Answer 4

(7/9)*6=14/3 hrs = 4 hrs 40 minutes

Answer 5

Discharge through the pipe
=Cd*1/2*rho*v^2*A
In this case it is asumedall else is
same for the 9" pipe as for 7" pipe
therefore the time will reduce
proportinatelysince it is diameter
we have to take squares
since as in formula above
area is involved in discharge
time reqd=(7/9)^2*6 hrs
=3.6296 hrs
=3hrs37 min 44sec

Answer 6

Ah, be conscious issues. 4-leaf clover? verify. Tin hat? verify. enable's dive in. this could be a kind of fee issues: how long does C take if A takes this long and B takes this long, etc. What you initiate up with is this: say that the pool can carry x gallons of water. To fill the pool with the pipe takes 5 hours, so the fee of filling is x/5 gallons consistent with hour. further, the fee of filling with a hose is x/7 gallons consistent with hour. Draining the pool could be seen "negatively filling" the pool, so which you need to assert that the fee of "filling" by utilising the drain is -x/9. Now with those fill rates in innovations, you are able to write an equation that shows how long it quite is going to take the pool to fill. Use t to signify the time: t (x/5 + x/7 - x/9) = x: time expanded by utilising mixed fill rates = finished i'm going to ingredient out one ingredient here, yet forget approximately it if it confuses you. it quite is efficient, yet on condition that it would not derail you from the main amazing ingredient. notice that usually you will get a sprint with regard to the look of the above equation by utilising pondering the units in contact. t is in hours. x is in gallons: t hours (x/5 + x/7 - x/9) gallons/hour = gallons you will discover that hours * gallons/hour = gallons. sometimes noticing units provides you help to in direction of the respond. yet once you are not getting that, forget approximately it for now and probably come back to it. it quite is not needed. Then in simple terms play around with the undemanding algebra: tx/5 + tx/7 - tx/9 = x tx + 5tx/7 - 5tx/9 = 5x 7tx + 5tx - 35tx/9 = 35x 63tx + 45tx - 35tx = 315x 63t + 45t -35t = 315 73t = 315 clean up for t and that's your answer, expressed in hours. stable luck!

Answer 7

You have to use a ratio to solve this one

7 pipes 9 pipes
______= _______
6 Hours x hours

Cross multiply

7x=54
x=7.7 hours

Answer 8

it will take 7 hours