Discussion
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
Answer: D
\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]
\[ 60 \text{ km/hr} = 60 \times \frac{5}{18} = \frac{50}{3} \text{ m/s} \]
A pole has no length, so the train covers only itself:
\[ L = \frac{50}{3} \times 9 = 150 \text{ metres} \]
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