The journey of a dog

A dog started running with acceleration \(a_1=2\text{ m/s}^2\) and ran like so for \(t_1=30\text{ s}\). Afterwards, he changed his acceleration and he went through the rest of the road for double the time of the first part. He then turned and continued home using the same road with acceleration \(a_1\). What is the average speed of the dog during the journey? Do not pay attention to the turning time.

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