Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x \(10^{-5}K^{-1}\),what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

• A.1.2x \(10^{-1}cm\)
• B.7.2x\(10^{-1}cm\)
• C.6x\(10^{-1}cm\)
• D.3.6x\(10^{-1}cm\)
• E.1.8x\(10^{-1}cm\)