Question 891473
1/3 of a job in 5 days works out to the whole job in 15 days
2/5 of a job in 10 days  works out to the whole job in 25 days

1/15+1/25=1/x
5/75+3/75=1/x
8/75=1/x
x=75/8=9.378 days = 9 days and 3 hours assuming an 8 hour day