alleryA 180 km trip takes 3.5 h: 60 km at 30 km/h, 60 km at 60 km/h. Last speed?
A150 km/h
B120 km/h
C90 km/h
D100 km/h
Answer & Solution
Correct answer: B. 120 km/h
The first two stages take 2 + 1 = 3 hours, leaving 0.5 hour for 60 km at 60 ÷ 0.5 = 120 km/h.
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