An iron rod and a zinc rod have lengths of 25.55 cm and 25.50 cm, respectively at 0 degree Celsius. At what temperature will the rods have the same

An iron rod and a zinc rod have lengths of 25.55 cm and 25.50 cm, respectively at 0 degree Celsius. At what temperature will the rods have the same length? The coefficient of expansion of iron and zinc are 0.000010 and 0.000030 per degree celsius, respectively.