Question 1153780
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A very different way of solving the problem, which I find much easier and faster....<br>
Since one of the bulldozers works twice as fast as the other, when working together one bulldozer does 2/3 of the work and the other does 1/3.<br>
So the slower bulldozer does 1/3 of the job in 3 days, which means it will take it 9 days to do the job alone.<br>
And the faster bulldozer works twice as fast, so it will take it half as long as the other to do the job alone -- 4.5 days.<br>
ANSWERS:
4.5 days alone for the faster bulldozer
9 days alone for the slower<br>