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 halffilled tank
or you have 36 L in the halffilled 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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