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A clock each time it increased 20 minutes , it stopped for 10min. How long will it take the minutes arrow to do 2 full rounds ?

 Aug 6, 2019
 #1
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My answer was 180 minutes 

 Aug 6, 2019
 #2
avatar+7764 
+1

It will take 30 minutes to turn 1/3 of a round,

So it will take 6(30) = 180 minutes to turn 6(1/3) = 2 rounds.

 Aug 6, 2019
 #3
avatar+24388 
+2

A clock each time it increased 20 minutes , it stopped for 10min.
How long will it take the minutes arrow to do 2 full rounds ?


\(\begin{array}{|rcll|} \hline \text{Time} &=& {\color{red}20}\ \text{min.} + 10\ \text{min.} +{\color{red}20}\ \text{min.} + 10\ \text{min.} + {\color{red}20}\ \text{min.} \quad | \quad \text{minutes arrow first round } 60\ \text{min.}\\ && + 10\ \text{min.}+{\color{red}20}\ \text{min.} + 10\ \text{min.} + {\color{red}20}\ \text{min.} + 10\ \text{min.}+ {\color{red}20}\ \text{min.} \quad | \quad \text{minutes arrow second round } 120\ \text{min.}\\ \text{Time} &=& 170\ \text{min.} \\ \hline \end{array}\)

 

laugh

 Aug 6, 2019

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