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Math Help - Work out the average speed in summer.

  1. #1
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    Work out the average speed in summer.

    In winter a train travels between two towns 264 km apart at an average speed of 72 km/h. In summer the journey takes 22 minutes less than in winter. Work out the average speed in summer.

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  2. #2
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    Well first you have to work out the duration of the entire trip in winter. This is given by \frac{264}{72} = 3.67 or 3 hours and 40 mins.

    The trip in summer is 22 mins less to it must take 3 hours and 18 mins (or 3.3 hours) . If the distance does not change and is still 264km and you know how long it takes, the average speed will now be a simple divsion 264 \div 3.3 hours
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