Thursday
March 23, 2017

Post a New Question

Posted by on Thursday, September 25, 2008 at 7:05pm.

it takes my father 3 hours to plow our cornfield with his new tractor using the old tractor it takes me 5 hours. if we both plow for 1 hour before i go to school, how long will it take dad to finish the plowing.

I got 2.5 hours but i think that is totally wrong?????

  • pre calc - , Thursday, September 25, 2008 at 7:18pm

    combined rate=field/3hrs + field/5hrs

    time=field/(field/3 + field/5)
    time= 15/(8)= less than your time.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question