-22.55 i think i used a cal but all u do is subtract the percentage with the number
The second one shows the solution
The average speed is 16.66 per second.

The longest side measures :
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Perimeter of a triangle is equal to sum of measures of its all three sides, that is :
and according to the question, the perimeter of the triangle is = 65 cm
so, let's equate both the expressions to find value of x :
The longest side of the Triangle is :