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Answer:
D. 12.5 min
Explanation:
Speed = distance ÷ time.
time = distance ÷ speed.
18km × 1000m = 18000m (as speed is in m/s).
time = 18000m ÷ 24.0m/s
t = 750s.
750s ÷ 60
= 12.5mins is your answer.
hope this helps. :)