alleryA trip takes 3 hours at 40 km/h. How long would it take at 60 km/h?
A4.5 hours
B1 hour
C2 hours
D2.5 hours
Answer & Solution
Correct answer: C. 2 hours
1. For a fixed distance, speed and time are inversely proportional.
2. Distance = 40 x 3 = 120 km, which is the constant product.
3. Time at 60 km/h = 120 / 60 = 2 hours.
_Source: Wikipedia, Proportionality (mathematics), Inverse proportionality_
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