exam Maths Puzzle Numerical Ability

Find AB if the coordinate of A is -5 and the coordinate of B is 17.

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exam Other Question

K=2m-3 over L Train A leaves a station traveling at 40 mph. Eight hours later trian B leaves the same staion in the same direction at 60 mgh. How long does it take for train B to catch up to train A? Thanks so much for helping me.