book Maths Puzzle Numerical Ability

When a 100-m building is imploded, about how long does it take for a piece that breaks off from the roof to fall to the ground ?

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I cannot figure out how to work this problem: Find the value of k so that the slope of the line is 3/2. (2+k)x+(2-k)y=15 . Any help would be greatly appriciated. "What is the meaning of open sentences"