There are three runners Deepak, Sandeep ...

There are three runners Deepak, Sandeep and Pawan with their respective speeds of 10 km/h, 20 km/h. They are initially at P and they have to run between the two points P and Q which are 10 km apart from each other. They start their race at 6 am and end at 6 pm on the same day. If they run between P and Q without any break, then how many times they will be together either at P and Q during the given time period?

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