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 220 cubic metres in 10 minutes. The inner radius of the pipe should be :
Select
A) √2 m  B) 2 m  C) 1 m  D) 1⁄√2 m  E) None of these
Let inner radius of the pipe be r.   Then, 220 = 22⁄7 × r2 × 7 × 10   or r2=220/22×10=1   or r = √1=1 m   Answer 1 m
<result>C</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 220 cubic metres in 10 minutes. The inner radius of the pipe should be :