SOLUTION: a car traveling 80 kilometers per houк is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are half a kilometer apart.
Algebra.Com
Question 874266: a car traveling 80 kilometers per houк is passed by a second car going in the same direction at a constant speed. After 30 seconds, the two cars are half a kilometer apart. Find the speed of the second car .
Hint: D=RT and 30 seconds=1/120hour
Please set up an equation. Thank you for your help!
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
a car traveling 80 kilometers per hour
time = 30/3600 hours = 1/120 hours
After 30 seconds,
d= 80*1/120
is passed by a second car going in the same direction at a constant speed.
let speed be x
After 30 seconds,
d= 1/120 * x
the two cars are half a kilometer apart.
1/120*x - 80/120 = 1/2
(x-80)/120 =1/2
x-80=60
x=80+60
x=140 km/h.........speed of second car
Find the speed of the second car .
RELATED QUESTIONS
A car traveling at 80 kilometers per hour is passed by a second car going in the same... (answered by ankor@dixie-net.com,richwmiller)
A car traveling 80 kilometers per hour is passed by a second car going in the same... (answered by MathLover1)
A car traveling at 70 kilometers per hour is passed by a second car going in the same... (answered by ankor@dixie-net.com)
A car traveling at 8o kilometers per hour is passed by a second car going in the same... (answered by mananth)
A car traveling at kilometers per hour is passed by a second car going in the same... (answered by Alan3354)
A car traveling at 40 kilometers per hour is passed by a second car going in the same... (answered by richwmiller)
A car traveling at 80 kilmeters per hour is passed by a second car going in the same... (answered by RAY100)
A car traveling 80 kilometers per hour is passed by a second car going in the same... (answered by mananth)
a car traveling at 75mph is passed by a second car going in the same direction at a... (answered by htmentor)