Mathematics
NULL
Medium
Question
Taps X and Y fill a tank in 10 hours and 15 hours. If both are opened together, when is the tank full?
A
3 hrs.
B
4 hrs.
C
5 hrs.
D
6 hrs.
✓ Official correct answer
Community credibility
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A
3 hrs.
No member explanations yet for this option.
B
4 hrs.
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C
5 hrs.
No member explanations yet for this option.
D
6 hrs.
No member explanations yet for this option.
Explanation
Combined rate = 1/10 + 1/15 = 1/6 tank per hour ⇒ time = 6 hours.