Jerry can detail a car by himself in 50 minutes. sally does the same job in 1 hour. how long will it take them to detail a car working together?

Jerry:

50 mins = 1 detailed car

1 min = 1/50 of the details

Sally:

60 mins = 1 detailed car

1 min = 1/60 of the details

If they work together:

1 min = 1/50 + 1/60 = 11/300 of the details

Total time needed:

300 : 11 = 27.27 mins

Answer: They will need 27.27 mins if they worked together.