Question 612342
Annie's speed = 1/6 project/hrs
Mya's speed = 1/9 project/hrs


If Annie and Mya work together, the speed will be:
1/6 + 1/9 = 3/18 + 2/18 = 5/18 project/hrs
For 1 project, the time taken if they work together will be:
{{{1/(5/18)}}} hrs
= 18/5 hrs
= 3 3/5 hrs
= 3 hrs + 3/5 * 60 mins
= 3 hrs + 36 mins


so, if they work together it will take 3 hours and 36 minutes to finish a project