if a gearbox is 70 percent efficient, and the HP measured at the output is 14 HP, how much Hp...

if a gearbox is 70 percent efficient, and the HP measured at the output is 14 HP, how much Hp applied to in input shaft?  and if the same gearbox had a reduction ratio, and an input speed pf 1500 rpm, what would the output shaft speed be? the efficiency of the gearbox is 70 percent?