The graph below shows part of a cycle journey for a boy. Copy the graph above. At

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The graph below shows part of a cycle journey for a boy.

Copy the graph above.
At 10:00 the cyclist decides to cycle back to the start point.
The average speed of the cyclist travelling back to the start is 5 km/h.
He gets back in two phases, each with a different constant speed.
a. Draw two possible lines for the two phases of the return journey.
b. Calculate the speed of each of the two phases of the journey back.

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