Sam and Ben started swimming at the same time from the opposite ends of a $$30\text{m}$$ swimming pool. Each boy would turn in the opposite direction and continue swimming upon reaching the end of the pool. The average speed of Sam was $$1{\text{m}}/{\text{s}} ;$$ and the average speed of Ben was $$0.6{\text{m}}/{\text{s}} ;$$. How many times did they meet each other if they swam for $$10\min $$? (We can assume that the turning time is negligible.) 
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