Deteriorating 78504

The hiker walked for 3 hours at a 4 km/h speed. Due to the deteriorating weather, he increased his pace and walked at 7 km/h for the next hour and a half. At the end of his trip, it started to rain, so he started running at a speed of 20 km/h for 30 minutes. What was his average speed for the entire trip?

Correct answer:

v =  6.5 km/h

Step-by-step explanation:

t1=3 h v1=4 km/h s1=v1 t1=4 3=12 km  t2=1.5 h v2=7 km/h s2=v2 t2=7 1.5=221=10.5 km  t3=30 min h=30:60  h=0.5 h v3=20 km/h s3=v3 t3=20 0.5=10 km  s=s1+s2+s3=12+10.5+10=265=32.5 km t=t1+t2+t3=3+1.5+0.5=5 h  v=s/t=32.5/5=6.5 km/h

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