Posted by **joi** on Sunday, October 23, 2011 at 9:28am.

A rectangular tank measures 60cm by 40cm by 30cm. It is half filled with water. Water is added to the tank at a rate of 13litres per minute and drained out at 9litres per minute. Find the volume of water in the tank after 7 minutes.

- Maths urgent help needed! -
**Reiny**, Sunday, October 23, 2011 at 9:35am
You already have 60x40x15

or 36000 cm^3 in the half-filled tank

or you have 36 L in the half-filled tank

The net increase from that point on is 4 L/min

So in the next 7 minutes, 28 L are added

Total volume = 36+28 = 64 L

- Maths urgent help needed! -
**joi**, Sunday, October 23, 2011 at 9:53am
thanks, just double checking to see if i got it right.

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