Jacob can write twice as fast as Nathan. Nathan wrote 25 letters in one hour. How many letters can the two write in 10 hours together?
How many letters does Jacob write in an hour? ** Since Nathan writes 25 letters in an hour, Jacob writes 25*2 = <<25*2=50>>50 letters in an hour.
How many letters do the two write in an hour together? ** Together, they write 50+25 = <<50+25=75>>75 letters in an hour,
How many letters will the two write in 10 hours together? ** In 10 hours, they'll write a total of 75*10 = <<10*75=750>>750 letters
#### 750