Posted by Anonymous on Thursday, September 16, 2010 at 8:10pm.
1/2 + 2/14 = x/150
Here is a common sense approach. In two minutes, they both paint 15 fences.
150fences=15fences/2min * time
time= 150*2/15=20 min
Now a more analytical approach.
The combined rate is the rate of each added.
ratecombined= 1fence/2min+14fence/2 min
= 15fence/2 min
150=15/2 * time and you have it.
opps! be sure to write the units out because I accidentally wrote 2 min/1 fence instead of 1 fence/ 2 min.
1 fence/2 min +14 fence/2 min= 150 fence/x min
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