The Singing Hedgehog Guide
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Ratio and Proportion 7

Here is a final example for a popular type of question:

We need to realise that 45km/h means 45 kilometres in 1 hour.

We can now, as usual, write the question as a ratio:

So we find the answer to be 12.5 m/s

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Ratio and Proportion 7

Here is a final example for a popular type of question:

A car travels at 45km/h.

What is this in m/s?

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:

distance | : | time | ||

45km | : | 1 hr = 60 mins |
work towards the objective of seconds | |

work towards the objective of metres | 45/60km = 0.75km = 750m | : | 1 min = 60 secs | divide by 60 to get 1 minute |

750/60m = 12.5m | : | 1 sec | divide by 60 again to get 1 sec |

So we find the answer to be 12.5 m/s