Steel rails 25.0m long are laid end to end with gaps between them to account for thermal expansion. Part A If the track is laid when it's 18 degrees C, how large should the gaps be to allow temperatures up to 39 degrees C? Part B If the track is laid using the gaps you found in part (a), how large will the gaps be on a -18 degrees C winter morning? Express your answers to two significant figures and include the appropriate units.