alleryRaising a car's speed by 5 km/h lets it finish a 60 km route 1 hour sooner. What was its original speed?
A12 km/h
B15 km/h
C10 km/h
D20 km/h
Answer & Solution
Correct answer: B. 15 km/h
60/s - 60/(s+5) = 1 gives s(s+5) = 300, so s = 15 km/h.
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