alleryA truck slowed by 6 km/h takes 1 extra hour on a 72 km route. What was its original speed?
A20 km/h
B24 km/h
C30 km/h
D36 km/h
Answer & Solution
Correct answer: B. 24 km/h
72/(s-6) - 72/s = 1 gives s(s-6) = 432, so s = 24 km/h.
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