Paul can mow grass in 50 minutes, but it takes dan three times as long. how long will it take them to mow the grass if they work together?

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.