A particle moves along x-axis with speed 6 m/s for the first half distance of a journey and the second half distance with a speed 3 m/s. The average speed in the total journey is 
(1) 5 ms/               (2) 4.5 m/s                  (3) 4 m/s                  (4) 2 m/s

Dear Student ,
Here is a link given below which will help you to solve this problem with proper explanation .
https://www.meritnation.com/ask-answer/question/a-person-travels-along-a-straight-road-due-east-for-the-firs/motion-in-a-plane/1713851
 

Regards

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