on a particular afternoon, C and B left their school at the same time and headed towards the bus stop. after running at an average speed 3 m/s for 30 seconds, C ran past their classmate A. A wos walking in the opposite direction from the bus stop back to school, os find A's average speed in m/s. he had left his pencil case in school. 20 seconds later,B walked past A. given that B average speed is 1 m/sec, find A average speed inm/sec
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