Answer:
Step-by-step explanation:
Given,
The number of cartons = k,
Time taken by machine a = 8 hours,
So, the number of cartons made by machine a in one hour
=
=
Time taken by machine b = 4 hours ,
So, the number of cartons made by machine b in one hour
=
Total cartons made in 1 hour =
∵ for the whole number value of k,
i.e. machine b is faster,
Also, the percent of the cartons were sealed by the machine b
Hence, OPTION D is correct.