Question

Vikas walks to his school which is at a distance of 4 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is​

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Boojho Home to school to again home

Boojho Home to school to again homeFrom home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hour

Boojho Home to school to again homeFrom home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hourAnd in returning from school to home time taken = 20 min = (20/60) hour = 0.33 hour

Boojho Home to school to again homeFrom home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hourAnd in returning from school to home time taken = 20 min = (20/60) hour = 0.33 houraverage speed = Total distance / time taken

Boojho Home to school to again homeFrom home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hourAnd in returning from school to home time taken = 20 min = (20/60) hour = 0.33 houraverage speed = Total distance / time taken= (3 + 3)/(0.5 + 0.33) km/h

Boojho Home to school to again homeFrom home to school distance is 3 km time taken is 30 min = (30/60) hour = 0.5 hourAnd in returning from school to home time taken = 20 min = (20/60) hour = 0.33 houraverage speed = Total distance / time taken= (3 + 3)/(0.5 + 0.33) km/h= 7.2 km/h