Question
David took 6 hours to drive from Point Q to Point R while Ivan took 4 hours to drive from Point R to Point Q. When they met each other, they were 39 km away from the midpoint of Point Q and Point R. What was David's speed?
3 m

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David took 6 hours to drive from Point Q to Point R while Ivan took 4 hours to drive from Point R to Point Q. When they met each other, they were 39 km away from the midpoint of Point Q and Point R. What was David's speed?