Answer:
9 Km per hour , 0.15 Km per minute
Step-by-step explanation:
Speed is calculated as
• speed = distance ÷ time
given distance is 12 Km and time taken is 1 hour 20 minutes
Convert time to hours
• 1 hour = 60 minutes
Then 20 minutes = [tex]\frac{20}{60}[/tex] = [tex]\frac{1}{3}[/tex] hour
Then 1 hour 20 minutes = 1 + [tex]\frac{1}{3}[/tex] = 1 [tex]\frac{1}{3}[/tex] hours = [tex]\frac{4}{3}[/tex] hours
speed = 12 ÷ [tex]\frac{4}{3}[/tex] = 12 × [tex]\frac{3}{4}[/tex] = 9 Km per hour
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1 hour 20 minutes = 60 + 20 = 80 minutes
speed = 12 ÷ 80 = 0.15 Km per minute