Water flows through a pipe of internal radius 3.5 cm at a speed of 2 m per second. Taking π = 22/7, how many litres of water flow out in one minute?
Correct answer A. 462 litres
Explanation
Flow per second = πr² x speed = 22/7 x 3.5 x 3.5 x 200 = 7700 cu cm. In 60 s: 462000 cu cm = 462 litres.
Answer checked How we write and check questions
Discussion