Problem Statement
Reducing speed by 10 km/h makes a 150 km trip take 30 minutes longer. What was the original speed?
Explanation
Let v be the original speed. 150 over v minus 150 over v minus ten equals minus one half hour. Solve v squared minus ten v minus three thousand equals zero. The positive root is sixty.
Code Solution
SolutionRead Only
150/(v−10) − 150/v = 0.5 ⇒ v^2 −10v −3000=0 ⇒ v=60
Practice Sets
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