Question : A car travels 120 km in 4 hours. Calculate its average speed in m/sec. [Give your answer correct to one decimal place.]
Option 1: 8.3 m/s
Option 2: 10.3 m/s
Option 3: 3.8 m/s
Option 4: 9.3 m/s
Correct Answer: 8.3 m/s
Solution :
Given: A car travels 120 km in 4 hours.
Use the formula, $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$
The distance of the car = 120 km = 120 × 100 = 1,20,000 m
Time = 4 hours = 4 × 3600 = 14,400 s
⇒ $\text{Speed}=\frac{120000}{14400}=8.3$ m/s
Hence, the correct answer is 8.3 m/s.
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