Question 161603
Distance is 1200 
The Wallaces take a trip by train and plane
The train is going 48 mph and takes 2 hrs longer than the plane
The plane is going 240 mph. 
What is the total time of the trip? 
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n = hours on the train 
p = hours on the plane
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48n + 240p = 1200
n = p+2
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Sub for n into the 1st eqn
48(p+2) + 240p = 1200
48p+96 + 240p = 1200
288p = 1104
p = 3 5/6 hours
n = 5 5/6 hours
Total time = 9 2/3 hours, or 9 hours 40 mins