John took 42 min to bicycle to his grandmother's house, a total of 4 km. What was his speed in km hr -1?
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Answer:
distance covered in 42 minutes = 4000 metre
distance covered in 1 minute = 4000/42 metre
distance covered in 60 minutes = 4000/42*60 metre
= 5714 2⁄7 metre/hour
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