exam Maths Puzzle Numerical Ability

Retangular shape:
240 m perimeter
length= triple the width.
Find: length and width

tried 3(x+x)=240

No go!

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exam Other Question
Could someone help me on this problem?

I need to rewrite the equation 4x- 10y = 11 as a function of x.

Thank you,
Sher 50km/1h*1h/3600s*/?/=13.9