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1. a first train travelling at x km an hour takes t hour less to travel y km than a slower one takes to travel z km . find the different between their speed
2. a man has one kind of coffee at 'a' paise
per kg and another at 'b' paise per kg how much of each must take to form a mixture of (a0b)kg which b can sell at c paise /kg without loss.

  • maths -

    I suggest you replace the variables with actual numbers and solve that problem.
    Then repeat the same steps using the variables in the given question.

    e.g.
    A first train travelling at 60 km an hour takes 2 hour less to travel 300 km than a slower one takes to travel 150 km . find the different between their speed

    time for 1st train = 300/60
    time for 2nd train = 300/60 + 2
    speed of 2nd train = 150/(300/60 + 2)

    difference in speeds = 60 - 150/(300/60 + 2)
    ( I purposely left the arithmetic open, so that you can see where the variables go)

    in the second question, I have no idea what (a0b)kg means

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