alleryAt 30 km/h a student reaches school 5 minutes late and at 40 km/h 5 minutes early. How far is the school?
A20 km
B25 km
C24 km
D18 km
Answer & Solution
Correct answer: A. 20 km
d/30 - d/40 = 10 min = 1/6 h gives d/120 = 1/6, so d = 20 km.
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