Answer:
Increase in temperature =  269.54 °C
Explanation:
We have equation for thermal expansion
     ÎL = LαÎT
Change in length, ÎL = 0.08 m
Length, L = 56 m
Coefficient of thermal expansion, α = 5.3 x 10â»â¶ °Câ»1
Change in temperature, ÎT = T - 253
Substituting
     0.08 = 56 x 5.3 x 10â»â¶ x (T - 253)
     (T - 253) = 269.54
      T = 522.54 °C
Increase in temperature =  269.54 °C   Â