Answer :
Volume of water through pipe = Volume of water in the tank
Radius of the tank(R) = 40cm = 0.4m
Increase in height(H) = 3.15m
Volume of the water in the tank = 
Let r be the internal radius of the pipe.
Velocity of water = 2.52km/hr
In half hour, distance travelled(L) = 2.52/2 = 1.26km = 1260m
Volume of water through pipe = Volume of water in the tank
⇒ 
⇒ 
⇒ 
⇒ r = 0.02m = 2cm
∴ Diameter of the pipe = 4cm
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