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Question

A gardener uses pipes to water his garden from the tank. For his entire garden he uses 6 pipes to water and it takes him 1 hour 20 minutes to completely empty the tank. Now if he uses only 5 pipes to water his garden, how long it will take him to empty the tank?


A

1 hour 30 mins

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B

1 hour 36 mins

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C

1 hour 45 mins

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D

1 hour 55 mins

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Solution

The correct option is B

1 hour 36 mins


Let the time required be x.
No. of pipes65Time taken (min)80X
It is inverse variation.


65 = x80
x =6×805 = 96 mins
x =1 hour 36 mins


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