Soal SMP · Penerapan · Kesulitan 3/5
A train travels from Town A to Town B at an average speed of 60 km/h and returns from Town B to Town A at an average speed of 40 km/h. What is the average speed for the whole journey?
- A.48 km/h
- B.50 km/h
- C.52 km/h
- D.45 km/h
Kunci jawaban & pembahasan
Jawaban: 48 km/h
Let distance one way = d. Total distance = 2d. Time = d/60 + d/40 = (2d+3d)/120 = 5d/120 = d/24. Average speed = total distance / total time = 2d / (d/24) = 48 km/h.
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