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Two persons A and B are standing at the ...

Two persons A and B are standing at the origin and 210 meter away from the origin along the y-axis, respectively. A starts to move along x axis with acceleration `3.2 m//s^(2)` and thereafter with the same retardation and comes to rest after moving 320 m B moves with a constant velocity and catches A in 15 s. The speed of B is `(10n)/(3)m//s`. Find the value of n.

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