The 'h' in honest is silent, as in 'hour'.

honest中的h与hour中的h一样都不发音。

《牛津词典》

The helicopter, named GEN H-4, has a set of two rotors turning in opposite directions and can fly at a maximum speed of 50 kilometres (31 miles) per hour.

这架代号为GEN H - 4的直升机有两个向相反方向旋转的旋翼，最高飞行速度可达每小时50公里。

youdao

The speed is then about 425 miles per hour so the horizontal component 300mi/h and the vertical component is also 300.

假定速度为425英里/时,那么水平分量,就是。

youdao

At low speeds, below about 15 miles per hour (m.p.h.), risks are low and increase relatively slowly with small increments in speed.

FORBES: In Crashes, Low Driving Speed Can Cause Serious Injury and Death to Pedestrians, Report Finds

The Brighton line, which carries B and Q trains through southern Brooklyn, was closed for an hour Tuesday morning after a report of a suspicious package near the Avenue H subway stop.

WSJ: Mayor Sets Precautions Following Boston Marathon Explosions