A vessel open at top contains 50 litres of water. A small opening is made at the bottom of vessel. It is observed that 3 litres of water comes out in time t₁, the next 3 litres in a further time t₂ and the next 3 litres in further time t₃, then:

• A

  t₁ = t₂ = t₃

• B

  t₁ < t₂ < t₃

• C

  t₁ > t₂ > t₃

• D

  t₁= t₂ < t₃