SOLUTION: a car travel 100km at a speed of 60km/h and returns with a speed of 40km/h. calculate the average speed for the whole journey.

Question 890881: a car travel 100km at a speed of 60km/h and returns with a speed of 40km/h. calculate the average speed for the whole journey.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
a car travel 100km at a speed of 60km/h and returns with a speed of 40km/h. calculate the average speed for the whole journey.
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average speed=distance traveled/time traveled
total time traveled=100/60+100/40=5/3+5/2=10/6+15/6=25/6
distance traveled=200
average speed=200/(25/6)=48
average speed for the whole journey=48 km/hr
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