Question 431177
It takes 3 hours for 2 cement mixers to mix a certain amount. How long would it take 5 cement mixers to do the job?
<pre>
Since it takes 3 hours for 2 cement mixers,
it would takes 6 hours for 1 cement mixer. Then
5 cement mixers could do it in 1/5 the time it takes
1 cement mixer to do it, so,

1/5 of 6 hours is  {{{expr(1/5)*6=expr(1/5)*expr(6/1)= 6/5 = 1&1/5}}}

1 and 1/5 hours which is 1 hour and 12 minutes.

Edwin</pre>