SOLUTION: "Two families are traveling by car to a camp 280 kilometers away. One family leaves 20 minutes ahead of the other family and travels at an average speed of 40 kilometers per hour.

Question 1031917: "Two families are traveling by car to a camp 280 kilometers away. One family leaves 20 minutes ahead of the other family and travels at an average speed of 40 kilometers per hour. 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?" Please help? I'm lost!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
"Two families are traveling by car to a camp 280 kilometers away. One family leaves 20 minutes ahead of the other family and travels at an average speed of 40 kilometers per hour. 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?"
-------
1st family DATA:
dist = 280 km ; rate = 40 kmh ; time = d/r = 280/40 = 7 hrs
------------------
2nd family DATA:
dist = 280 km ; rate = x kmh ; time = 280/x hrs
-----
Equation:
7 + (1/3) hrs = 280/x
20/3 = 280/x
20x = 3*280
x = 3*14 = 52 kph (speed of the 2nd family)
-----------------------------
Cheers,
Stan H.
RELATED QUESTIONS
Two families are traveling by car to a camp 280 kilometers away. One family leaves 20... (answered by ikleyn)

Two families are traveling by car to a camp 280km away. One family leaves 20 minutes... (answered by ankor@dixie-net.com)

I've been stuck on this question for awhile and I'm confused: Two families are... (answered by stanbon)

2 cars are traveling to a place 280 km away. One car leaves 20 minutes before the other... (answered by oberobic)

Ashley and Brittany are cousins were going on a trip with their families to visit their... (answered by ikleyn)

Two families meet at a park for a picnic. At the end of the day, one family travels east... (answered by ankor@dixie-net.com)

In a certain city, 55% of the families own only one car and 20% own exactly two cars. One (answered by Fombitz)

two families meet at a park for a picnic. At the end of the day one family travels east... (answered by stanbon)

Twenty pounds of potatoes are divided between 2 families. One family receives 2 pounds... (answered by fractalier)