Question 594159
1/45 + 1/40 = 1/t


360t*(1/45) + 360t*(1/40) = 360t*(1/t)


8t + 9t = 360


17t = 360


t = 360/17


t = 21.176


So if they worked together, it would take them approximately <font color="red">21.176 minutes</font>.