A truck covers a distance of 150km at a certain average speed and then covers another distance of 200km at an average speed which is20km per hour more than the first speed .if truck covers the total distance in 5hrs find the first speed
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5=150/x+200/x+20
5=150x+3000+200x/x^2+20x
5x^2-250x-3000=0
5x^2-300x-50x-3000=0
(5x+50)(x-60)
so x=60km
x+x+20=60
2x=40
x=20km
5=150x+3000+200x/x^2+20x
5x^2-250x-3000=0
5x^2-300x-50x-3000=0
(5x+50)(x-60)
so x=60km
x+x+20=60
2x=40
x=20km
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