Amit, Bipin and Chetan were running on a 180m circular track.
Chetan is running in a direction opposite to Amit and Bipin. All three start running from the same point at the same time. Average speed of Bipin is 4m per second, which is twice that of Amit, but half of Chetan. When three of them meet for the first time, the number of complete rounds made by Amit, Bipin and Chetan are