Algebraic Expression (Time)

Question

Ryan can mow a lawn in 1 hour and his son Malik can mow the same lawn in 50 minutes. One day Malik started mowing the lawn himself and worked 30 minutes. then Ryan joined him and they finished the lawn. How long did it take them to finish the lawn after Ryan joined to help?

Answer 1

So Ryan cuts one-half of the lawn,

Start after that. Ryan would need 30 minutes to finish it, Malik would need 25 minutes

 

m / 30 + m / 25 = 1

 

Can you solve for m and answer?