It is required to fix a pipe such that water flowing through it at a speed of 7 metres per minute fills a tank of capacity 110 cubic metres in 10 minutes. The inner radius of the pipe should be : Choose the correct choice from the following answers:
A) √2 m  B) 2 m  C) 1⁄2 m  D) 1⁄√2 m  E) None of these
Let inner radius of the pipe be r.   Then, 110 = 22⁄7 × r2 × 7 × 10   or r2=110/22×10=1/2   or r = 1/√2 m   Answer 1⁄√2 m
<result>D</result>
It is required to fix a pipe such that water flowing through it at a speed of 7 metres per minute fills a tank of capacity 110 cubic metres in 10 minutes. The inner radius of the pipe should be :