Discussion
A train running at the speed of 60 km/hr crosses a pole in 9 sec. What is the length of the train?
Answer: B
\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]
\[ 60 \text{ km/hr} = \frac{50}{3} \text{ m/s} \]
\[ L = \frac{50}{3} \times 9 = 150 \text{ m} \]
150 m is not among the listed values, so the answer is none of these. The data are complete, which rules out "cannot be determined".
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