A man walks to a village at 6 km/h and rides back by tonga at 18 km/h. The round trip takes 4 hours in all. How far is the village?
Correct answer C. 18 km
Explanation
d/6 + d/18 = 4 gives 4d/18 = 4, so d = 18 km. Check: 3 hours walking plus 1 hour riding = 4 hours.
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