SOLUTION: Two families are traveling by car to a camp 280km away. One family leaves 20 minutes ahead of the other family and travels at an average of 40 km/h. Waht would the speed of the sec
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Question 1118168: Two families are traveling by car to a camp 280km away. One family leaves 20 minutes ahead of the other family and travels at an average of 40 km/h. Waht would the speed of the second family’s car need to be if the family is to reach the camp at the same time as the first family? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! Two families are traveling by car to a camp 280km away.
One family leaves 20 minutes ahead of the other family and travels at an average of 40 km/h.
What would the speed of the second family’s car need to be if the family is to reach the camp at the same time as the first family?
:
find the time it takes the 1st family to travel 280 km at 40km/h
280/40 = 7hrs
:
let s = speed of the 2nd car to arrive in 7 hrs - 20 min or 6 hrs
s * 6 = 280
s * = 280
multiply equation by 3
20s = 3 * 280
20s = 840
s = 840/20
s = 42 km/h will make arrive at the same time
:
:
Check: 42 * 6.667 = 280.0
