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     EduGorilla 
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    The duration of a railway journey varies directly as the distance and inversely as the velocity. The velocity varies directly as the square root of the quantity of coal used per kilometre and inversely as the number of carriages in the train. For a journey of 50 km in half an hour with 18 carriages, 100 kg of coal is required. How much coal will be consumed in a journey of 42 km in 28 minutes with 16 carriages?

    Options :-

    1. 64 kg
    2. 72 kg
    3. 100 kg
    4. None of these
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