Which of the following are not correct?
The speed of a train is expressed in m/h.

Explanation

To determine whether the statement "The speed of a train is expressed in m/h" is correct or not, we can analyze the units involved in measuring speed.

### Step 1: Understand the Units of Measurement
Speed is defined as the distance traveled per unit of time. The standard units for measuring speed are typically in kilometers per hour (km/h) or meters per second (m/s).

### Step 2: Analyze the Given Statement
The statement claims that the speed of a train can be expressed in meters per hour (m/h).

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