SOLUTION: A pipe can fill a tank in 40 minutes. and another pipe have twice radius of the privius pipe is taken..then how many minute will it take to fill the tank?

Question 550158: A pipe can fill a tank in 40 minutes. and another pipe have twice radius of the privius pipe is taken..then how many minute will it take to fill the tank?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A pipe can fill a tank in 40 minutes. and another pipe have twice radius of the privius pipe is taken..then how many minute will it take to fill the tank.
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Area of the pipes is proportional to the square of the radius, so if you double the radius, the area increases by 4 times, which means you need only 1/4 of the time to fill the tank=1/4*40=10 min.
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