Mathematics
NULL
Medium
Question
A and B cycle the same way at 6 and 12 km/h. A car overtakes them in 9 s and 10 s. What is the car's speed?
A
22 km/hr
B
33 km/hr
C
66 km/hr
✓ Official correct answer
D
44 km/hr
Community credibility
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A
22 km/hr
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B
33 km/hr
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C
66 km/hr
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D
44 km/hr
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Explanation
Relative-speed equations give car speed = 66 km/h.