A U-tube has both arms open to the atmosphere. Water is poured in from one arm and light oil (ρ = 790 kg/m^{3}) from the other. One arm then contains a 70-cm-high water column, while the other arm contains both fluids (oil on top of water) with an oil-to-water height ratio of 4. Determine the height of each fluid in that second arm (answers in m).