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Answer the following question based on the information above.
You want to tie 8 pieces of rope together by knotting one piece with another. Each knot takes you 15 seconds. How long will it take to join all eight pieces?

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90 seconds.

135 seconds.

105 seconds.

120 seconds.

answer is D.

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Detailed Solution

Number of knots	Joined pieces of rope	Time taken
1	2	15 seconds
2	3	30 seconds
3	4	45 seconds
4	5	60 seconds
5	6	75 seconds
6	7	90 seconds
7	8	105 seconds

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