exam Maths Puzzle Numerical Ability

Can someone please help me solve this linear system in three variables?

x-3y=11
5y+z=4
-x+z=2
{(?,?,?)}

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exam Other Question

Two trucks started toward each other at the same time from towns 270km apart.
One truck averaged 70km/h and the other averaged 65km/h. after how many hours did they pass each other?
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