Practice question

MCQ

Question

An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?

Options

Choose one · Correct answer highlighted

72 Correct 73 74 75

Explanation

72 is correct because it matches established general principles where 72 represents the functional mechanism. Alternatives such as 73, 74 contradict experimental evidence and standard textbook descriptions. This reasoning aligns with standard definitions, laboratory observations and quantitative analysis commonly taught in biotechnology curricula.

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