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 880 cubic metres in 10 minutes. The inner radius of the pipe should be :  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, 880 = 22⁄7 × r2 × 7 × 10   or r2=880/22×10=4   or r = √4=2 m   Answer 2 m
<result>B</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 880 cubic metres in 10 minutes. The inner radius of the pipe should be :