There are three professional swimmers A,B and C who can swim at speed of 11 km/hr, 8 km/hr and v km/hr respectively. A and B move from P to Q whereas C from Q to P. Now, B starts from P and swims towards Q 50 km away. Speed of the current from P to Q is 2 km/hr. A and C start half an hour later than B. What should be the speed of C so that all three meet together ?

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