Question 371190
rate of car on level ground be x mph
on the mountains it will be x-30 mph
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distance traveled on level ground = 400 miles
distance traveled in the mountains = 160 miles
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t = d/r
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time is sdame on both legs.
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400/x=160/(x-30)
400(x-30)=160x
400x-12000=160x
+12000     +12000
400x = 160x+12000
-160x   -160x
240x=12000
/240
240x/240 = 12000/240
x=50 mph on level ground
in the mountains it will go at 50-30 = 20 mph
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m.ananth@hotmail.ca