book Maths Puzzle Numerical Ability

Hi my son is doing these story problems and he is stuck on this one problem could you please help explain it to him and I?
A 19-inch wire is cut in half. How long is each piece?

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book Other Question

a small plane flying in the same direction as the wind, travelled 600 km in 2 h. The return trip, flying against the wind, took 3 h. Find the speed of the plane and the wind. What is the opposite of a real number?