book Maths Puzzle Numerical Ability

Raul found that by increasing his speed by 5 km/hr, he could drive 12km in 0.2 hrs. What was his original speed?
____kilometers per hour

thanx

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book Other Question

Construct a scatter diagram of the following data treating year as independent variable and mobile phone usage (in millions) as dependent variable.

Year, t
From a square piece of cardboard with width x inches, a square of
width x − 3 inches is removed from the center. Write the area of
the remaining piece as a function of x.