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Rates, SM-Bank 082 MC

The nutritional information on a breakfast cereal is shown below.

 

 
Marjorie expends 1000 kJ of energy by jogging for 30 minutes.

If she consumes 100 grams of the cereal, approximately how long should she jog to use up the energy it provides?

  1. 30 minutes
  2. 40 minutes
  3. 60 minutes
  4. 80 minutes
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\(B\)

Show Worked Solution

\(100\ \text{grams of cereal}\rightarrow 1320\ \text{kJ}\)

\(\text{Exercise required}\) \(=\dfrac{1320}{1000}\times 30\)
  \(\approx 1.3\times 30\)
  \(\approx 40\ \text{minutes}\)

 
\(\Rightarrow B\)