Rahul and Ankit are cycling on the same road and they are coming towards each other. The speed of Rahul and Ankit is 15 km/h and 25km/h respectively. A dog starts running from Rahul to Ankit when the distance between them was 60 km. Once the dog reaches Ankit, it immediately starts running back to Rahul and this goes on until Rahul & Ankit meet. The speed of the dog is 30 km/h. What is the total distance travelled by the dog in km?
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it's too long question
........
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