A cuboidal water tank is $4$ m long, $3$ m wide and $2$ m high. Water flows into it at $4$ litres per second…

A cuboidal water tank is $4$ m long, $3$ m wide and $2$ m high. Water flows into it at $4$ litres per second. The time to fill the empty tank is:
  1. $30$ minutes
  2. $100$ minutes
  3. $50$ minutes
  4. $60$ minutes

Solution

Volume $= 4 \times 3 \times 2 = 24 \text{ m}^{3} = 24000$ L. Time $= \dfrac{24000}{4} = 6000$ s $= 100$ minutes.

Asked in: IMO

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