Question

A team of 20 people can construct a bridge in 40 days. Another team of 25 people can complete in same constuction in 60 days . If both together work, in how many days the bridge can be constructed

Answer 1

one day's work of 20 people = 1/40
one day's work of 25 people = 1/60

one day's work of both the group = 1/60 + 1/40
= 1/24

this means the work can together be done in 24 days.

Answer 2

24 days ................