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The volume V of litres of petrol in a car’s tank is decreasing at a rate of ...
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The volume V of litres of petrol in a car’s tank is decreasing at a rate of
\left (\frac {2}{5}-\frac {1}{50} x\right ) litres
/ \mathrm {km} after travelling for
x kilometres. If the volume is 4 litres when
x=0, determine the number of kilometres the car travels until the tank is empty.
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