Question : A journey takes 4 hours 30 minutes at a speed of 60 km/h. If the speed is 15 m/s, then the journey will take:
Option 1: 5 hours
Option 2: 5 hours 30 minutes
Option 3: 6 hours
Option 4: 6 hours 15 minutes
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Correct Answer: 5 hours
Solution : The distance can be calculated using the formula: Distance = Speed × Time. Given: Speed is 60 km/h and the time is 4.5 hours (4 hours 30 minutes). Distance = 60 × 4.5 = 270 km The speed is changed to 15 m/s = $\frac{18}{5}×15=54$ km/h. Time = $\frac{\text{Distance}}{\text{Speed}} = \frac{270}{54} = 5$ hours Hence, the correct answer is 5 hours.
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