Discussion
The distance between the capital of India (New Delhi) and the capital of Bihar (Patna) is 792 km. If an express bus covers this distance in 11 hours, the average speed of the bus in metre per second is :
Answer: A
The average speed is 20 m/s.
\[ \begin{aligned} \text{speed} &= \frac{792\ \text{km}}{11\ \text{h}} = 72\ \text{km/h} \\ 72 \times \frac{5}{18} &= 20\ \text{m/s} \end{aligned} \]
To convert km/h to m/s, multiply by \(\frac{1000}{3600} = \frac{5}{18}\).
72 m/s is the speed left in km/h with the wrong unit attached, which is the main trap. 36 m/s and 15 m/s come from conversion errors.
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