Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>EXERCISE>Q 10

MEDIUM

8th CBSE

IMPORTANT

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A cistern has two inlet pipes $A$ and $B$ which can fill it in $8$ hours and $6$ hours, respectively. An outlet pipe $C$ can empty the full cistern in $4$ hours. If the pipes $A, B$ and $C$ are opened simultaneously in the empty cistern, how much time will they take to fill the cistern completely $?$

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Important Questions on Time and Work

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>HOTS>Q 1

A

can do a piece of work in

20

days and

B

in

30

days. They began to work together but

A

left after some days.

B

finished the remaining work in

10

days. After how many days did

A

leave?

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>HOTS>Q 2

$A$ pipe can fill a tank in $10$ hours. Due to a leak at its bottom, the tank takes $2$ hours extra to fill. If the tank is full, in how much time will it be emptied by the leak $?$

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>HOTS>Q 3

Pipe

A

can fill an overhead tank in

10

hours and pipe

B

can fill it in

15

hours. Both the pipes are opened and after

4

hours pipe

B

is closed. How much time will

A

take to fill the remaining part of the tank

?