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    Question

    The ratio of the speeds of Train A, Train B, and Train C

    is 3:5:7 respectively. Train D moves 6 km/hr slower than Train B. If the difference between Train C and Train A’s speed is 48 km/hr, what is the ratio of speed of Train B to Train D?
    A 5:4 Correct Answer Incorrect Answer
    B 11:9 Correct Answer Incorrect Answer
    C 10:9 Correct Answer Incorrect Answer
    D 9:10 Correct Answer Incorrect Answer

    Solution

    Let speeds be 3x, 5x, and 7x respectively. 
    So, Train D’s speed = 5x - 6
    ATQ, 
    7x - 3x = 48 
    Or, 4x = 48 
    Or, x = 12
    Train B = 5 × 12 = 60 
    Train D = 60 - 6 = 54
    Required ratio = 60:54 = 10:9  

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