The required distance across the lake is 240 m. Hence correct option is A.
What are Similar triangles?
Similar triangles, are those triangles which have similar properties i.e. angles and proportionality of sides.
Since, triangles are similar.
The ratio of their sides are also equal
60/20= L/80
L=80 x 3
L = 240 m
Thus, the required distance across the lake is 240 m.
Learn more about similar triangles here:
brainly.com/question/25882965
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