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 440 cubic metres in 10 minutes. The inner radius of the pipe should be :
Pick one:
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, 440 = 22⁄7 × r2 × 7 × 10   or r2=440/22×10=2   or r = √2 m   √2 mnswer √2 m
<result>A</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 440 cubic metres in 10 minutes. The inner radius of the pipe should be :