“I’m very tired from working here,” said Jean to her friend Kate.“I’m on my feet from morning to night.For the first qua

“I’m very tired from working here,” said Jean to her friend Kate.“I’m on my feet from morning to night.For the first quarter of the day,I clean up the counter(柜台)and set the table.For the next quarter,I help in the kitchen.For the second half of my workday I take orders at the counters.”
“Kate,I wish I had your job,” Jean went on.“for four hours you just sit at the cash register(收款台)taking in money.”
“But I spend two more hours in the kitchen than you do,” said Kate.“It’s tiring to cook over a hot stove.I don’t think you’d really want my job.In fact,I’d like your job.”
47.How long did they work every day?
A.Eight hours B.Twelve hours
C.Ten hours D.Nine hours
48.How long did Kate spend in the kitchen?
A.A quarter day B.A half day
C.One-third day D.Three-four day
请写出来怎么算出来的。