A gear train shown in the figure consists of gears P, Q, R, and S. Gear Q and gear R are mounted on the same shaft. All the gears are mounted on parallel shafts and the number of teeth of P, Q, R and S are 24, 25, 30 and 80 respectively. Gear P is rotating at 400 rpm. The speed (in rpm). The speed(in rpm) of the gear S is
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