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On a straight road cyclist are riding one after the other at a separation of 30m at a speed of 10m/s.in the same direction boys

On a straight road cyclist are riding one after the other at a separation of 30m at a speed of 10m/s.in the same direction boys are running at a separation of 20 m at a speed of 5m/s. If a old man is walking in opposite direction. find his speed so that he will meet each cyclist and boy together?

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