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X and Y are two cars. X starts from P and runs non-stop towards Q at a constant speed. Y starts from Q at the same time as X and runs non-stop towards P at a constant speed. They cross each other at R where PR = 30 km, and continue their run. X reaches Q and after a 10 minute halt there, starts back to P at its old speed. Similarly Y reaches P, halts there for 10 minutes and then starts back to Q at its old speed. They now cross each other at S where QS = 8 km. Find the distance PQ (in km).

 
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