speed per hour

例句：

1. 1.The car accelerates to a speed of 60 miles per hour.
   汽车以每小时60英里的速度加速。
2. 2. The hikers are determined to reach their destination in one day's time.
   登山者决心在一天内到达目的地。
3. 3. The ship sailed at a steady speed of 25 knots.
   这艘船以每小时25节的速度航行。