SOLUTION: If 2 planes leave an airport in opposite directions and the 1st plane takes off 15 mins before the 2nd traveling 120 mph and the 2nd plane is traveling 132. How long until the plan

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Question 464261: If 2 planes leave an airport in opposite directions and the 1st plane takes off 15 mins before the 2nd traveling 120 mph and the 2nd plane is traveling 132. How long until the planes are 400 miles apart?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
st=d
120(t+.25)+132t=400
120t+30+132t=400
252t=370
t=1.468 hr = 1:28
.
Ed