Problema Solution
Taylor and Blair are driving away from each other in opposite directions. If Blair's speed is 70 mph and Taylor's speed is 80 mph, how many hours will it be before the two are 225 miles apart?
Answer provided by our tutors
Let
v1 = 70 mph Blair's speed
v2 = 80 mph Taylor's speed
d = 225 mi
t = the time of the travel in hours
Since speed = distance/time follows distance = speed*time.
v1t + v2t = d
70t + 80t = 225
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click here to see the solution for the time t
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t = 1.5 hr
After 1.5 hours or 1 hour and 30 min the two cars will be 225 miles apart.