Question

2 people can plough a field in 6 hours
how long would it take for 3 people to plough the field?

Answer 1

I believe it would be 3. Since for 2 people it took 6 hours (3 hours per person) when we have three people, it . should subtract 3 hours which would make it 3.

Answer 2

it is indirect proportion

no of people=2                    3

time taken   =6                     y

2 x 1/10 (because 6 hrs into min)=3y

(2 x 1/10)/3=y

1/15 x 60 =y

4=y

we can do

2 x 6=3y

2 x 6/3=y

4=y