The Singing Hedgehog Guide to:
Ratio and Proportion
Here is a final example for a popular type of question:
A car travels at 45km/h.
What is this in m/s?
We need to realise that 45km/h means 45 kilometres in 1 hour.
We can now, as usual, write the question as a ratio:
1 hr =
work towards the objective of seconds
work towards the objective of metres
1 min =
divide by 60 to get 1 minute
divide by 60 again to get 1 sec
So we find the answer to be 12.5 m/s
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