Question 839596
2/10+2/9+2/15+x/10+x/9=1
(19x)/90+5/9 = 1
(19 x)/90=4/9 
(19 x)/10=4 
19x=40
x = 40/19
x = 2.1053 days more to finish
BTW they would have finished in 3.6 days total with all three .