Biff can mow three rugby fields in 10 hours. Marty can mow 2 rugby fields in 7 hours. If they work together, how long would it take them to mow 10 rugby fields?

Answer 1

Biff can mow three rugby fields in 10 hours. This means he can mow 21 rugby fields in 70 hours.

Marty can mow 2 rugby fields in 7 hours. This means that he can mow 20 rugby fields in 70 hours.

Together, they can mow 41 rugby fields in 70 hours. This is equivalent to 10 rugby fields in how many hours?