80km/h 应读作80kilometer per hour还是80kilometers per hour?

80km/h 应读作80kilometer per hour还是80kilometers per hour?
80km/h 应读作80kilometer per hour还是80kilometers per hour?

80km/h 应读作80kilometer per hour还是80kilometers per hour?
It can run at 80 kilometers per hour for short periods.
Driving at 50mph(80 kilometers per hour)uses 25 percent less fuel than 70mph.50英里的时速（即每小时80公里）比70英里时速省油25%.
要加S可数

80kilometers per hour