9.
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A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
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A.
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3 hrs 15 min
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B.
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3 hrs 45 min
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C.
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4 hrs
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D.
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4 hrs 15 min
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Answer: Option B
Explanation:
Time taken by one tap to fill half of the tank = 3 hrs.
Part filled by the four taps in 1 hour =
|
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4 x
|
1
|
|
=
|
2
|
.
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6
|
3
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Remaining part =
|
|
1 -
|
1
|
|
=
|
1
|
.
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2
|
2
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x =
|
|
1
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x 1 x
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3
|
|
=
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3
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hours i.e., 45 mins.
|
2
|
2
|
4
|
So, total time taken = 3 hrs. 45 mins.
