Pipe A can fill a tank in , and pipe B can fill it in . If both pipes are opened together, how long will they take to fill the empty tank completely?
Answer and explanation
Correct answer: D.
- Step 1: Rate of pipe A is tank per hour, and rate of pipe B is tank per hour.
- Step 2: Combined filling rate is tank per hour.
- Step 3: Time required is .
Answer
.
Why not the others: evaluates ; averages the two times. does not fit.
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