Question

If x people can complete a job in h hours what part of the same job can one person working alone complete in k hours.
a) k/xh
b) h/xk
c) k/x+h
d) kh/x
e) kx/h

Answer 1

\[\frac{ x }{ h }=\frac{ 1 }{ k }\]
use cross multiplication to solve for 1