exam Maths Puzzle Numerical Ability

two cars left an intersection at the same time. one traveled north. the other traveled 14 miles farther in the same amount of time, but to the east. how far apart were they at that

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12-3(x=1)=+17

To solve I first multiply 3 timesx then move x from right to left then add 12 and 17, I am geeting confused. Please help me solve.
Thank you Theta = x
If x is an acute angle with cos x = 1/9, find the exact value of sin a/2.