Question 1021785: Two brothers leave from the same point driving in opposite directions, the first brother driving at 65 miles per hour and the second at 55mph. The first brother has a one-hour head start. How long will they be able to talk on their car phones if the phones have a 300-mile range?
The phones will be out of range ______ hours after the first brother left.
(Simplify your answer. Type an integer, fraction, or mixed number
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! Two brothers leave from the same point driving in opposite directions, the first brother driving at 65 miles per hour and the second at 55mph. The first brother has a one-hour head start. How long will they be able to talk on their car phones if the phones have a 300-mile range?
let x=travel time of 2nd brother
x+1 =travel time of 1st brother
speed*travel time =distance
55x+65(x+1)=300
55x+65x+65=300
120x=235
x=1.96
The phones will be out of range 1.96 hours after the first brother left.
|
|
|
