Ratio of times taken by Amar and Badal = 1 : 2 The time difference is (2 - 1) 1 day while Badal take 2 days and Amar takes 1 day. If difference of time is 1 days, Badal takes 2 days. If difference of time is 15 days, Badal takes =
2
1
×15=30 days So, Amar takes 30 days Amar's 1 day's work =
1
15
Badal's 1 day's work =
1
30
(Amar + Badal)'s 1 day's work together =
1
30
+
1
15
=
3
30
=
1
10
∴ Amar and Badal together can do the work in = 10 days