Two runners start together from the same point along the same road at 9 km/h and 12 km/h. How far apart are they after 40 minutes?
Correct answer A. 2 km
Explanation
The gap grows at 12 − 9 = 3 km/h. In 40 minutes = 2/3 hour, the gap is 3 × 2/3 = 2 km.
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