SOLUTION: two cars leave an intersection at the same time. one travels north. the second car travels south and is driving three times as fast as the first car. after one hour they are 100 mi

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Question 853724: two cars leave an intersection at the same time. one travels north. the second car travels south and is driving three times as fast as the first car. after one hour they are 100 miles apart. what are their speed
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
The cars are travelling in opposite direction.

let speed of one car be x
other is 3x
The effective speed is 4x
time = 1 hour
distance = 100
speed = distance / time
4x= 100/1
4x=100
x=25
one car speed = 25 mph
other car speed = 3x = 75 mph