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Mathematics: Post your doubts here!

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so do u mean that we should caculate the total distance from graph :/?
No, when you make the graph, you'll get the idea of max velocity=15. Then 15/y=0.0375 <--- last portion of graph, where y : 400. So, you add 400+ 600+ 2600 to get total time. (x) in the graph ive drawn.
 

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