1.

water is flowing at the rate of 3 kilometre per hour through a circular pipe of 20 CM internal diameter how much area will it get in 30 minute if it is 10 cm of standing water is needed.​

Answer»

The cistern is in cylindrical shape.Volume of a cylinder =πR 2 hRadius of cistern = 210 m=5mHence, volume of the cistern =π×5×5×2m 3 Radius of pipe = 220 cm=10cm= 10010 m= 101 mSince the pipe is cylindrical in shape, Volume =π(Radius) 2 ×heightHere, height is considered as the distance TRAVELED =3km=3000m.Hence, volume of water coming out of pipe in one HOUR =π×( 101 ) 2 ×3000m 3 Now, TIME taken to fill the cistern = Volume of water coming out of pipe in one hourVolume of the cistern = π× 101 × 101 ×3000π×5×5×2 = 35 hours=1 hour + 32 hours =1 hour + 32 ×60 MIN =1 hour 40 minutes



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