Party A and Party B process parts. Party A processes nine parts in ten minutes and Party B processes fourteen parts in fifteen minutes?

Party A and Party B process parts. Party A processes nine parts in ten minutes and Party B processes fourteen parts in fifteen minutes?

A processing per minute: 9 / 10
B processing per minute: 14 / 15
There are 27 / 30 in a and 28 / 30 in B, so B is more than a
B is efficient