Question

39. If one student can complete the decorations for the prom in 5 days

working alone, another student could do it in 3 days, and a third could
do it in 4 days, how long would it take them working together?

Answer 1

1.3 days

Explanation:

1/5+1/4+1/3

12/60+20/60+15/60= 47/60

60/47

=1.3