3runners compete in a race. the probabilities that the 3 runners finish the race in under 10 seconds is 1/4,1/6,2/5. what's the probability that at least one of the runners will finish the race in under 10 seconds?

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle