SOLUTION: It takes Mang kaloy 3 hours to plow his ricefield with his new tractor. Using the old tractor, it takes him 5 hours. If his son helped him plow the field, how long will it take the

Algebra ->  Rate-of-work-word-problems -> SOLUTION: It takes Mang kaloy 3 hours to plow his ricefield with his new tractor. Using the old tractor, it takes him 5 hours. If his son helped him plow the field, how long will it take the      Log On


   



Question 396116: It takes Mang kaloy 3 hours to plow his ricefield with his new tractor. Using the old tractor, it takes him 5 hours. If his son helped him plow the field, how long will it take them to plow the ricefield using both tractors?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The new tractor does 1/3 of the field per hour.
The old one does 1/5 per hour.
Together, the do 1/3 + 1/5 per hour.
Can you finish it?