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Q.

A long piece of rope has to be cut into 5 pieces. Each cut takes you 30 seconds.

Each of those 5 pieces now needs to be cut into two pieces. Each cut takes you the same 30 seconds. How long will it take to cut the 5 pieces into 10 pieces?

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a

120 seconds.

b

150 seconds.

c

180 seconds.

d

300 seconds. 

answer is B.

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Detailed Solution

Each cut is going to produce 2 pieces.

Each of the 5 pieces needs to be cut once so 5 cuts = 30+30+30+30+30 = 150 seconds.

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