A manuscript should be typed in half an hour for Party A and in one third an hour for Party B. the efficiency of Party A is the same as that of Party B

A manuscript should be typed in half an hour for Party A and in one third an hour for Party B. the efficiency of Party A is the same as that of Party B


It takes half an hour for a manuscript to be typed and one third an hour for a manuscript to be typed,
The efficiency of a is 2 / 3 of that of B
(1÷1/2)÷(1÷1/3)=2/3