contestada

Bobby and Mike have a summer job mowing the school yard once a week. The school provides them with two riding lawn mowers.One mower requires 7 hours to mow the school yard, while the other could cover the school yard in 6 hours. How long will the job take using both mowers? (Round your answer to the nearest tenth.)

Respuesta :

Step-by-step explanation:

The first mower can mow 1/7 of the yard in 1 hour.

The second mower can mow 1/6 of the yard in 1 hour.

Together, they can mow 1/7+1/6+13/42 of the yard in 1 hour.

So it would take them 42/13 hours to mow the entire yard.

42/13=3.2307 hours.

Rounded to the nearest tenth this would be 3.2 hours.

Otras preguntas