The lengths of two rods made up of the same metal and having the same area of cross-section are $0.6 \mathrm{m}$ and $0.8 \mathrm{m}$ respectively. The temperatures between the ends of first rod are $90 °\mathrm{C}$ and $60 °\mathrm{C}$ and that for the other rod are $150 °\mathrm{C}$ and $110 °\mathrm{C}$ respectively. For which rod the rate of conduction will be greater.