How many litres of water flow out of a pipe having an area of cross-section of 5 cm2 in one minute, if the speed of water in the pipe is 30 cm/sec?
Given,
Area of cross section of pipe = 5 cm2
Speed of water flows through pipe = 30 cm/s
So, volume of water flows through pipe in 1 second = area of cross section × rate of flow
= 5×30 = 150 cm3
Hence , volume of water flows through pipe in 1 minute(60second) =
= 60×150 = 9000 cm3 = 
28