Rafa takes 30 minutes to cover a distance of 3.5 km on a bicycle. What is her speed in Km/hr?
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Answer: 7
Explanation:
1 hour=60 mins
1 mins=1/60 hour
30 mins=30/60
= 0.5 hour
Speed=distance/time
=3.5/0.5=7 km/hr
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