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Direct proportion, rates and scale
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Direct proportion, rates and scale
Direct proportion, rates and scale
Example 1
A vehicle travels 420km in 7 hours at a steady rate. How far does it travel in 6 hours?
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Answer: 360
- Rate =7420=60km/h. Distance =60×6=360km.
Example 2
A map scale is 1:4000. A line is 3cm on the map. Find its real length in metres.
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Answer: 120
- Real length =3×4000cm. Divide by 100 centimetres per metre to get 120m.
Example 3
y is directly proportional to x. When x=6,y=12. Find y when x=3.
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Answer: 6
- The constant is xy=2, so y=2x. At x=3,y=6.
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