Question 636806
Jeff starts driving at 55mph from the same point Lauren starts driving at 70mph.
 They drive in the opposite directions and Lauren has a half hour head start.
 How long will they be able to talk on their cellphones that have a 280 mile range?
:
t = talking time as they travel in opposite direction
:
Write a distance equation; dist = speed * time
:
55t + 70(t+.5) = 280
55t + 70t + 35 = 280
125t = 280 - 35
125t = 245
t = 245/125 = 49/25
t = 1{{{24/25}}} hrs they can talk on the cell phone