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    Question

    A driver of truck sees an ambulance 160 meters ahead of

    him. After 20 seconds the ambulance is 140 meters behind. If the speed of the truck is 80 kmp/h, then what is the speed of the ambulance?
    A 45km/hr Correct Answer Incorrect Answer
    B 28km/hr Correct Answer Incorrect Answer
    C 36km/hr Correct Answer Incorrect Answer
    D 26km/hr Correct Answer Incorrect Answer
    E 34km/hr Correct Answer Incorrect Answer

    Solution

    Relative speed = (total distance )/(total time ) = (160+140)/20 = 15 m/sec Speed in km/hr = 15 × 18/5 = 54 km/hr Relative speed = speed of truck – speed of bike 54 = 80 – speed of ambulance Speed of ambulance = 80 – 54 = 26km/hr

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