The average speed of a car is 600 metres/minute. How much slower (in metres/second) does the car run than a sprinter who covers 100 metres in 9.6 seconds?
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A.
1/2
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B.
5/24
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C.
7/12
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D.
5/12
Correct Answer:
D. 5/12
Explanation:
To find the difference in speed, first convert the car's speed to metres per second by dividing 600 by 60, which equals 10 m/s. Next, calculate the sprinter's speed by dividing 100 metres by 9.6 seconds, resulting in 125/12 m/s. Subtracting the car's speed of 10 m/s (or 120/12 m/s) from the sprinter's speed of 125/12 m/s shows that the car is 5/12 m/s slower.
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