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Starting at home, Michael traveled uphill to the gift store for 24 minutes at just 10 mph. He then traveled back home along the same path downhill at a speed of 30 mph.

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irspow
Where is the question?

d=vt

d=10(24/60)=4 miles

It is 4 miles to the gift store.

4mi(hr/30mi)(60min/hr)=8 min

It took him 8 minutes on the return trip, for a round-trip time of 32 minutes.

His average speed was (8mi/32min)(60min/hr)=15mph for the whole trip.

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