SOLUTION: Eric is 1 mile ahead of Dave Eric is driving 60 mph Dave is driving 70 mph in the same direction How many miles til Dave catches Eric? Could you show me the formula for this

Question 142720: Eric is 1 mile ahead of Dave
Eric is driving 60 mph
Dave is driving 70 mph in the same direction
How many miles til Dave catches Eric?
Could you show me the formula for this question also?
This is not out of a book, a friend from work asked me this and told me the answer was 4.9999miles, and I wanted to make sure he was right. Thanks
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
d=st d=distance, s=speed, t=time
d+1=70t for Dave
d=60t for Eric.
.
60t+1=70t Replace 60t for d in the 1st equation.
10t=1
t=1/10 hr until Dave catches Eric.
In that .1 hr Dave goes 6 mi and Dave goes 7 mi
.
Ed

RELATED QUESTIONS
Dave and Sam are racing in the Dallas NASCAR Race. Dave is traveling at 187 mph and Sam... (answered by ankor@dixie-net.com)

this is is kinda confusing, need your help guys. alan and dave leave from the same... (answered by ptaylor)

Alan and Dave leave from the same point driving in opposite directions, Alan driving at... (answered by giveback,josmiceli)

Alan and Dave leave from the same point driving in opposite directions. Alan driving at... (answered by checkley77)

In a race, Carl starts 1 mile behind Dave. Carl is traveling at 45 miles per hour, while... (answered by richwmiller)

Please help me solve this word problem? Alan and Dave leave from the same point driving... (answered by rothauserc,josmiceli)

If Dave is running 4 mph, how long will it take him to run 8... (answered by algebrahouse.com,jim_thompson5910)

Kato rode his bike 98 miles last week. That is two fewer than four times the number of... (answered by Edwin McCravy)

Bobby is driving at 70 mph and passes a car going 60 mph. How far ahead of the passed car (answered by Alan3354)