ISEE Mathematics Achievement Question 97: Answer and Explanation
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Question: 97
13. One man 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.
minutes - B.
minutes - C.
minutes - D. 10 minutes
Correct Answer: B
Explanation:
The correct answer is (B). The first man can load 
of the truck in 1 minute. The second man can load 
of the truck in 1 minute. The third man can load 
of the truck in 1 minute. Together they can load 
+ 
+ 
of the truck each minute.
of the truck loaded per minute. The whole job then requires 
minutes, or 6
minutes.