Problema Solution
A farmer can plow a field in 24 hours. His son, with a larger plow, can plow it in 12 hours. The farmer asked that they worked together so they could finish before the rain started. It rained in 7 hours later. Had they finished they plowing before the rain?
Answer provided by our tutors
let 'x' represent the number of hours they worked together:
1/24 + 1/12 = 1/x
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x=8
It would take them 8 hours, 1 hour after the rain began.