[5/(1.5 *10^3) + 10/(2.49*10^3)]*(1.5 *10^3*2.49*10^3)/(1.5 *10^3+2.49*10^3)[5/(1.5 *10^3) + 10/(2.49*10^3)]*(1.5 *10^3*2.49*10^3)/(1.5 *10^3+2.49*10^3)

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