Fluid Mechanics Viscosity Question 160

Question: A large tank is filled with water to a height H. A small hole is made at the base of the tank. It takes $ T_{1} $ time to decrease the height of water to$ H/\eta $ , $ \left( \eta >1 \right) $ and it takes $ T_{2} $ time to take out the rest to water. If $ T_{1}=T_{2} $ , the value of $ \eta $ is:

Solution:

Answer: 0.50