If viola runs at a speed of 12 km/h, how long will she take to run a 400 metre race?
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Answer:
20 minutes
Step-by-step explanation:
speed =distance/time
speed=12Km/h
distance=400 m= 400/1000=0.4 Km (1Km=1000m)
12=0.4/T
T=0.4/12
T= 1/30 hours
T=1/30hr= 1/30×60min. (1hour=60 minutes)
T= 20minutes
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