Consider the common measurement: speed = 55 mph. what is the physical quantity?

speed
mph
miles per hour
55

can someone explain the answer to this question?

The best and most correct answer among the choices provided by your question is the first choice or letter A. Speed is the physical quantity.
A physical quantity is a quantity in physics that can be measured. Or a physical quantity is a physical property that can be quantified. Examples of physical quantities are mass, amount of substance, length, time, temperature, electric current, light intensity, force, velocity, density, and many others

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