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Kindly refer the following link of the similar question for your answer:
https://www.meritnation.com/ask-answer/question/a-car-travels-from-a-to-bat-aspeed-of-20km-h-and-returns-at/motion-in-a-straight-line/2838251
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https://www.meritnation.com/ask-answer/question/a-car-travels-from-a-to-bat-aspeed-of-20km-h-and-returns-at/motion-in-a-straight-line/2838251
Regards