Mathematics
Medium
Question
A and B go cycling in the same direction with speeds of 6 km/hr and 12 km/hr. A car from behind passes them in 9 and 10 seconds respectively. What is the speed of the car?
A
22 km/hr
B
33 km/hr
C
66 km/hr
✓ Official correct answer
D
44 km/hr
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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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