Properties of Matter

Two large, identical water tanks, 1 and 2 , kept on the top of a building of height H , are filled with water up to height h in each tank. Both the tanks contain an identical hole of small radius on their sides, close to their bottom. A pipe of thesame internal radius as that of the hole is connected to tank 2, and the pipe ends at the ground level. When the water flows the tanks 1 and 2 through the holes, the times taken to empty the tanks are t1 and t2 , respectively. If H=(‌

16

9

)h , then the ratio t1∕t2 is _________.