Question

a one man can work in 1 min and 100 people can work in how min?​

Answer 1

1 min because everyone is working together

Answer 2

1 man can do a work in 1 minute.
1 min = 60 seconds
100 man can do the work in 60/100
$= \frac{60}{100 } \\ = \frac{3}{5} \\ = 0.6$
:. 100 men will do the work in 0.6 sec.

✌✌