Question
A coach driver drove the first 4 hours of a journey at an average speed 57 km/h. Driving at an average speed of 85 km/h, he then took another 5 hours to complete his remaining journey. Find his average speed for the whole journey. Give your answer in mixed number.
3 m

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A coach driver drove the first 4 hours of a journey at an average speed 57 km/h. Driving at an average speed of 85 km/h, he then took another 5 hours to complete his remaining journey. Find his average speed for the whole journey. Give your answer in mixed number.