SOLUTION: A car traveling at 70 kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are 500 meters apart. Find the s
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Question 758091: A car traveling at 70 kilometers per hour is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are 500 meters apart. Find the speed of the second car.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A car traveling at 70 kilometers per hour is passed by a second car
going in the same direction at a constant speed.
After 30 seconds, the two cars are 500 meters apart.
Find the speed of the second car.
:
let s = speed of the passing car
:
We're working km/hr:
change 500 m to km
change 30 sec to hrs
:
Write a distance equation; dist = speed * time
:
Passing car dist - 70 km/hr car dist = 500 meters
s - (70) =
multiply eq by 120 to cancel the denominators, results:
1s - 1(70) = 120*
s - 70 = 60
s = 60 + 70
s = 130 km/hr speed of the passing car
;
:
Confirm this by finding the distance each car traveled
*130 = 1.08 km
* 70 = .58 km
-------------------------
difference in dist: .5 km which is 500 m
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