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23 x 2 = 2 (p+l)
23 m = p + l
p x l = 60
(p+l)^2 = p² + l² + 2pl
(23)^2 = p² + l² + 2x60
529 = p² + l² + 120
409 = p² + l²
(p-l)² = p² + l² - 2pl
p-l = √ 409 - 120
= √ 189
= 17
p + l = 23
p - l = 17
-------------- +
2p = 40
p = 20 m
p-l = 17
20 - l = 17
l = 3 m