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.
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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.