A car is moving in a straight line from city A to city B then city C. Let the distance between city A to B is 240 km and between city A and C is 320 km. The car moves from A to C in 6 hrs and back to B from C in 2 hrs. What will be the average velocity of the car?
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A.
30 km/hr
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B.
40 km/hr
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C.
53.66 km/hr
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D.
50 km/hr
Correct Answer:
A. 30 km/hr
Explanation:
To calculate the average velocity, we must determine the total displacement and the total time elapsed. The car moves from city A to city C (320 km) and then returns to city B. Since city B is 240 km from A, the final displacement from the starting point A is 240 km toward city C. The total time taken for the entire journey is the sum of the time from A to C (6 hours) and C to B (2 hours), totaling 8 hours. Dividing the displacement of 240 km by the total time of 8 hours results in an average velocity of 30 km/hr.
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