单项选择题

John can mow a field in 6 hours.Bill can mowa field in ……

John can mow a field in 6 hours. Bill can mowa field in 5 hours. Henry can mow a field in 4 hours. Joe can mowa field in 3 hours. Tomcan mowa field in 2 hours. If they all work together at their respective rates, how long will it take to mow the field

A．1.4 minutes
B．39.4 minutes
C．40.4 minutes.
D．38.4 minutes.

<上一题目录下一题>

热门试题

单项选择题Why does the article advise people to look at prize-winning books

A．To copy the author’s style.
B．To realise what a high standard needs to be reached.
C．To get an idea of what might be successful.
D．To find out how to trick publishers.

问答题Where should the money for improvements come from

问答题Who should be able to use the pool free

问答题What other sports should be catered for locally

问答题What does he feel about the facilities

问答题What would he most like to see added

问答题What about entry charges

问答题What does he feel about the opening times

问答题How often does he use the public swimming pool

问答题What is the interviewee’s occupation