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a wheel spins at a rate of 9 revolutions for 5 seconds. How long will it take to spin for 20 revolutions?

colbster  Apr 3, 2017
 #1
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5 / 9   =   x / 20        cross-multiply

 

20 * 5  = 9 * x        divide both sides by 9

 

[ 20 * 5 ] / 9   = x

 

100 / 9    = x   =   11 + 1/9     seconds

 

 

cool cool cool

CPhill  Apr 3, 2017

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