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Eric took 2 hours to travel 3/5 of a journey. He completed the remaining 84 km in 1 hour. What was Eric's average speed for the whole journey?

 Apr 20, 2022
 #1
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Let the total distance of the journey==D

 

1  - 3/5D ==2/5D -this equals the remaining 84 km

 

2/5D == 84    Cross multiply

 

2D ==84 x 5 ==420, solve for D

D ==420 / 2==210 km - total distance of his journey.

 

Average speed ==Total distance / total time

                           == 210 / 3 ==70 km/hour -his average speed for the entire trip.

 Apr 20, 2022
 #2
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correct

Kakashi  Apr 20, 2022

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