A man drives from his home at 30 km per hour to the shopping centre which is 20 km from his home. On the return trip he encounters heavy traffic and averages 12 km per hour. How much time does the man take in driving to and from the shopping centre?
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Answer:
time=time going + time returning
time=(20 mi)/(30 mph)+(20 mi)/(12 mph)
time=2/3 hr + 5/3 hr
time=7/3 hr
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ANSWER: The man spent 2 hours and 20 minutes (7/3 hours) driving.
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