Starting at home, Ishaan traveled uphill to the grocery store for 12 minutes at just 15 mph. He then traveled back home along the same path downhill at a speed 30 mph. What is his average speed for the entire trip from home to the grocery store and back?
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Average speed = total distance/total time
Distance uphill = distance downhill
Time in hrs uphill = 12/60 = 0.2 hrs
Speed = 15 m/h
Distance = speed × time
= 15 × 0.2 = 3m
Time downhill = 3/30 = 0.1 hrs
Total time = 0.1 + 0.2 = 0.3 hrs
Total distance = distance uphill + distance downhill
= 3 + 3 = 6m
Speed = distance / time
= 6/0.3 = 20 mph
= 20 mph
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