Cool Algebra V

Level pending

Two stations P and Q are 240Km apart. A train A starts from P for Q and travels uniformly. An hour later another train B starts from P and travelling for 2hrs, comes to a point that A had passed 45min before. The speed of B is now increased by 5Km/hr and it overtakes A just entering Q. Find the rate(speed in Km/hr) at which B started? (Please upload the solution)

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