1.

A cylindrical drum, open the top, contains 30 liters of water. It drains out through a small opening at the bottom. 10 litres of water comes out in time t_(1), the next 10 litres in further time t_(2) and the last 10 liters in further time t_(3). Then,

Answer»

`t_(1)=t_(2)=t_(3)`
`t_(1)GT t_(2)lt t_(3)`
`t_(1)lt t_(2)lt t_(3)`
`t_(2)gt t_(1)=t_(3)`

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