book Maths Puzzle Numerical Ability

A car starts at 7 AM and travels at 80 kph. Another car starts at 10 AM from the same place and goes in the same direction. How fast will it have to go to catch up with the first one by 4 PM of the same day?

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book Other Question

Find the roots of the quadratic equations using the quadratic formula. Express the roots, if they are not rational, in simplest radicl form.

4x^2 - 12x - 7 = 0 if i am traveling at 35 miles per hour, how long will it take me to travel 7 miles? also, i would like to see the formula. thanks, jerry