SOLUTION: two friends start walking in opposite directions one walks 5mph the other walks 4mph they are talking on radios with a 20mi radius how long can they talk?
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Question 216049: two friends start walking in opposite directions one walks 5mph the other walks 4mph they are talking on radios with a 20mi radius how long can they talk?
i'm not sure how to set up the equation tried lots of times and doesnt come out right Found 2 solutions by Alan3354, ankor@dixie-net.com:Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! two friends start walking in opposite directions one walks 5mph the other walks 4mph they are talking on radios with a 20mi radius how long can they talk?
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Going opposite directions, their speeds are added. 5+4 = 9 mph
They'll be 20 miles apart in 20/9 hours
= ~ 2.222 hours
You can put this solution on YOUR website! two friends start walking in opposite directions one walks 5mph the other walks 4mph they are talking on radios with a 20mi radius how long can they talk
:
They can talk until they are more than 20 mi apart
:
Let t = how long they can talk
;
Write a distance equation dist = speed * time
:
5t + 4t = 20
9t = 20
t =
t = 2 hrs or 2 hr and *60 = 13.33 min
;
:
Check (20/9) ~ 2.22 hrs:
4(2.22) + 5(2.22) =
8.88 + 11.10 = 19.98 ~ 20 mi
