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单选题
Bill can inspect a case of cell phones in 6 hours. Jack can inspect the same case of cell Phones in 4 hours. After working alone for l hour, Bill stops for lunch. After taking a 30-minute lunch break. Bill and Jack work together to inspect the remaining cell phones. How long do Bill and Jack work together to complete the job?
A
1 hr. and l2 min
B
1 hr. and 24 min
C
2 hrs
D
2 hrs and lo min
E
2 hrs and 20 min
参考答案
参考解析
解析：
If x represents the number of hours Bill and Jack work together, then the total number of Bill’s working hours is x+1. Bill’s rate of work is 1/6 of the job per hour, and the Jack’s rate of work is 1/4 of the job per hour. Hence, (x+1)/6+x/4=1. x=2.
If x represents the number of hours Bill and Jack work together, then the total number of Bill’s working hours is x+1. Bill’s rate of work is 1/6 of the job per hour, and the Jack’s rate of work is 1/4 of the job per hour. Hence, (x+1)/6+x/4=1. x=2.
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After the cell-phone ban is ended, students can use their phones during class.B
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a bill of lading does not failB
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考题
单选题Bill can inspect a case of cell phones in 6 hours. Jack can inspect the same case of cell Phones in 4 hours. After working alone for l hour, Bill stops for lunch. After taking a 30-minute lunch break. Bill and Jack work together to inspect the remaining cell phones. How long do Bill and Jack work together to complete the job?A
1 hr. and l2 minB
1 hr. and 24 minC
2 hrsD
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