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    Question

    A driver of an army truck sees an ambulance 80 meters

    ahead of him. After 10 seconds the ambulance is 70m behind. If the speed of the truck is 104kmph, then what is the speed of the ambulance?
    A 45km/hr Correct Answer Incorrect Answer
    B 57km/hr Correct Answer Incorrect Answer
    C 36km/hr Correct Answer Incorrect Answer
    D 50km/hr Correct Answer Incorrect Answer
    E 47km/hr Correct Answer Incorrect Answer

    Solution

    Relative speed = totaldistance/totaltime = (70+80)/10 = 15 m/sec Speed in km/hr = 15 ×18/5 = 54 km/hr Relative speed = speed of truck – speed of ambulance 54 = 104 – speed of ambulance Speed of ambulance = 104 – 54 = 50km/hr

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