Question

hai plz help me in the 25th or questions plzz
the water flows at a rate

Answer 1

Speed of water =2.52 km/hr = 2520 m/hr
length =2520m/hr
let the radius of the pipe=r
and the radius of the tank=40 cm=4/10cm
length of tank in half hour = 3.15m
length of tank in hour = 2*3.15m
=6.3 M
Now volume of the pipe = volume of the tank
πr^2 *2520 = π * 4/10*4/10*6.3
r^2=1/2500 M
r=1/50M
Diameter = 2/50M 
=200/50 CM
= 4 CM