New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A train travels from Station A to Station B at a speed

    of 60 km/h and returns from Station B to Station A at a speed of 40 km/h. Find the average speed for the entire journey.
    A 48 km/h Correct Answer Incorrect Answer
    B 50 km/h Correct Answer Incorrect Answer
    C 55 km/h Correct Answer Incorrect Answer
    D 52 km/h Correct Answer Incorrect Answer

    Solution

    Let the distance between A and B be D km. Time taken to travel from A to B = D / 60 hours. Time taken to travel from B to A = D / 40 hours. Average speed = 2 × (Speed1 × Speed2) / (Speed1 + Speed2)  = 2 × (60 × 40) / (60 + 40)  = 4800 / 100 = 48 km/h. Correct option: a

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