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Question
Boojho walks to his school which is at a distance of 3 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 ______.
Options
8.3
7.2
5
3.6
MCQ
Fill in the Blanks
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Solution
Boojho walks to his school which is at a distance of 3 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 7.2.
Explanation:
Average speed = `"Total distance"/"Time taken"`
= `((3 + 3)"km")/((1/2 + 1/3)"h"`
= `6/(5/6)`
= `36/5`
= 7.2 km/h
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