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    Question

    A farmer traveled a distance of 61 km in 9 hours. He

    traveled partly on foot at the rate of 4 km per hour and partly on bicycle at the rate of 9 km per hour. The distance travelled on foot is:
    A 17 km Correct Answer Incorrect Answer
    B 16 km Correct Answer Incorrect Answer
    C 15 km Correct Answer Incorrect Answer
    D 14 km Correct Answer Incorrect Answer

    Solution

    (x/4) + [(61 – x)/9] = 9 9x + 4 × 61 – 4x = 36 × 9 5x + 244 = 324 x = 80/5 = 16 km

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