SSAT Math Question 192: Answer and Explanation
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Question: 192
11. If one pipe can fill a tank in 
hours, and another can fill the same tank in 45 minutes, how long will it take for the two pipes to fill the tank together?
- A.
hour - B.
hour - C.
hour - D. 1 hour
Correct Answer: B
Explanation:
The correct answer is (B). The first pipe can fill the tank in 1
, or 
, hours; that is, it can do 
of the job in 1 hour. The second pipe can fill the tank in 45 minutes, or 
of an hour, or it can do 
of the job in 1 hour. Together the pipes can complete 
of the job in 1 hour. 
= 2, or twice the job in 1 hour. Therefore, together the 2 pipes could fill the tank in 
hour.