exam Maths Puzzle Numerical Ability

Line segment MS and line segment NR are medians of triangle MNK. If MS = 15, NR = 18, and MN = 21. what is the perimeter of triangle PRS?

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I have a couple questions that are word problems.

Carlos and Maria drove a total of 258 miles in 5 hours. Carlos drove the first part of the trip and averaged 53 miles per hour Given: FG is congruent to FJ
HG is congruent to IJ

Prove: HF is congruent to IF