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∵光在真空中的傳播速度為v=3×108m/s,則光在某透明物質中傳播速度v′=25v=25×3×108m/s=1.2×108m/s,∴光60秒在在該透明物質中傳播的距離s=v′t=1.2×108m/s×60s=7.2×109m.故答案為:7.2×109.
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