Question

Person A can complete painting a wall in 10 days alone, person B can do the same task in 20 days alone, while person C can finish the task in 60 days alone. If they start working together, how many days will they take to paint a wall?

Answer 1

Answer:

1/10+1/20+1/60= 1/10+1/15=1/6

therefore number of days= 1/(1/6) = 6 days