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🚀 速度距离时间计算器Speed, Distance & Time Calculator
填写速度、距离、时间中的任意两个，计算第三个。Enter any two of speed, distance and time to calculate the third.
使用说明与常见问题How-to & FAQ
「速度距离时间计算器」是什么？What is the Speed, Distance & Time Calculator?
填写速度、距离、时间中的任意两个，计算第三个。Enter any two of speed, distance and time to calculate the third.
如何使用「速度距离时间计算器」？How do I use the Speed, Distance & Time Calculator?
在「速度距离时间计算器」中，填写「速度 km/h」、「距离 km」、「时间(小时)」等参数，结果会随输入实时计算并显示在下方。In the Speed, Distance & Time Calculator: Fill in "Speed km/h", "Distance km", "Time (h)"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「速度距离时间计算器」使用教科书标准公式，并列出所用公式和中间值，适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Speed, Distance & Time Calculator uses standard textbook formulas and shows them, which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「速度距离时间计算器」免费吗？需要注册吗？Is the Speed, Distance & Time Calculator free? Do I need an account?
「速度距离时间计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Speed, Distance & Time Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.