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In a 100 m race, A runs at 6 km/hr. If A...

In a 100 m race, A runs at 6 km/hr. If A gives B a start of 8 m and still beats him by 9 seconds, what is the speed of B?

A

4.6 km/hr

B

4.8 km/hr

C

5.2 km/hr

D

5.4 km/hr

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