The abbreviation h/hr is used to denote which time unit?

• A. minute
• B. hour
• C. second
• D. day

Answer: (B)

Abbreviations for time units use h or hr to mean hour. This is why writing 3 h or 3 hr indicates three hours. Minutes are shown as min or m, seconds as s or sec, and days as d or day. The h/hr form is commonly used in time calculations and schedules, and it helps keep track of duration in hours, which is especially important for things like calculating speeds (for example, kilometers per hour).