CMA Foundation · Fundamentals of Business Mathematics and Statistics · Time and Distance
A train travels at 72 km/h. What is its speed in metres per second?
The speed is 20 metres per second. To convert kilometres per hour into metres per second, multiply by 5/18. So 72 x 5/18 equals 20 m/s. Multiplying by 18/5 instead would wrongly inflate the figure.
- A15 m/s
- B18 m/s
- C20 m/sCorrect
- D25 m/s
Explanation
To convert km/h to m/s multiply by 5/18: 72 x 5/18 = 20 m/s. Option 18 m/s wrongly uses 72/4, and 25 m/s comes from multiplying by 18/5 incorrectly in part.
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