SOLUTION: at 6 AM a snowplow, traveling at a constant speed, begins clearing a highway leading out of town. A 8 AM an automobile traveling the highway at a speed at 30 mi/hr and reaches the

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Question 565171: at 6 AM a snowplow, traveling at a constant speed, begins clearing a highway leading out of town. A 8 AM an automobile traveling the highway at a speed at 30 mi/hr and reaches the snowplow 30 minutes late. Find the seed of the snowplow.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Snowplow speed be x
in 2 hours before the car starts it has traveled 2x miles
Catch up distance = 2x
catchup time = 1/2 hour
catchup rate = 30-x ( since they are travelling in same directions
2x/(30-x)=1/2
cross multiply
4x=30-x
4x-x=30
2x= 30
/2
x=15 mph---- speed of snowplow