Average speed 4

Starting at home Tony traveled uphill to the store for 45 minutes at 8 miles per hour. he then traveled back home on the same path at a speed of 24 miles per hour. what is his average speed for the entire trip?

Correct result:

v =  12 mph

Solution:

t1=45/60=34=0.75 h v1=8 mph v2=24 mph s=v1⋅ t1=8⋅ 0.75=6 km t2=s/v2=6/24=14=0.25 h v=2⋅ s/(t1+t2)=2⋅ 6/(0.75+0.25)=12 mph

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