Question : A person crosses a 900-metre-long street in 6 minutes. The speed of the person, in km/hr, is:
Option 1: 10
Option 2: 9
Option 3: 5
Option 4: 8
Correct Answer: 9
Solution : Given, Length of the street = 900 m = 0.9 km Time = 6 min = $\frac{6}{60}$ hours = $\frac{1}{10}$ hours We know, Speed = $\frac{\text{Distance}}{\text{Time}}$ = $\frac{0.9}{\frac{1}{10}}$ km/hr = 9 km/hr Hence, the correct answer is 9.
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