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2,5 m ----w---- 60 s (1min)
1 m ----w----- x s
x = 60 s * 1m / 2,5 m = 24 s
b)
2,5 m ----w---- 1 min
6 m ---w----- x min
x = 6 m * 1min / 2,5 m = 2,4 min = 2 min 24 s