Average speed is calculated as total distance divided by total time taken. Here, the distance is 120 km and the time is 3 hours. Dividing 120 by 3 gives 40 km/h. Therefore, the car’s average speed over the journey is 40 km/h.
Option A:
Option A is correct because the straightforward computation 120 ÷ 3 = 40 yields the average speed. This aligns with the definition of speed as distance per unit time. In exam settings, quickly identifying such basic calculations saves valuable time for more complex questions.
Option B:
An average speed of 30 km/h would correspond to travelling 90 km in 3 hours, not 120 km. Since the actual distance travelled is greater, this option underestimates the speed. Hence, it is incorrect.
Option C:
A speed of 50 km/h over 3 hours would give a distance of 150 km, which is higher than the given 120 km. This shows that 50 km/h is too high for the conditions described.
Option D:
A speed of 60 km/h for 3 hours would produce a distance of 180 km, which is much larger than 120 km. Therefore, 60 km/h does not match the data and cannot be the correct answer.
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