SSAT Math Question 145: Answer and Explanation
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Question: 145
7. One person can load a truck in 25 minutes, a second can load it in 50 minutes, and a third can load it in 10 minutes. How long would it take the three together to load the truck?
- A. 5
minutes - B. 6
minutes - C. 8
minutes - D. 10 minutes
Correct Answer: B
Explanation:
The correct answer is (B). The first person does 
of the job in 1 minute. The second person does 
of the job in 1 minute. The third person does 
of the job in 1 minute. Together: 
+ 
+ 
= 
, or 
, of the job in 1 minute. This is 
minutes for the entire job, or 
minutes.