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Solution: If the distance is X kilometers, the meeting point will be at x-4 kilometers. This process takes (x-4)/ 10 hours. The time for A to go is the time for B to go to the turning point+the time for B to come back+the time for B to start again =2.5/5 +2.5/5 +(x-4)/ 10. 5 +(x-4)/ 10]*5=x-4, x= 14 A: ab distance 14 km.

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