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

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8th CBSE

IMPORTANT

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If an inlet pipe fills the tank in $n$ hours, it will fill part of the tank in $2$ hours.

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Important Questions on Time and Work

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8th CBSE

IMPORTANT

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

An inlet pipe fills the tank in

n

hours and the outlet pipe empties the tank in

m

hours. If both the pipes are opened simultaneously, then the part of the tank filled in

1

hour is_____

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8th CBSE

IMPORTANT

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

Dev can remove the weeds from a garden in $15$ days and Subhash can do the same work in $10$ days. How long will they take to remove the weeds when working together $?$

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8th CBSE

IMPORTANT

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

A

and

B

can do a piece of work in

10

days.

A

alone can complete this work in

15

days. In how many days can

B

alone do it

?

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8th CBSE

IMPORTANT

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

Rani can complete

\frac{1}{5}

of a work in

6

days and Sudarshan can complete

\frac{1}{4}

of the same work in

5

days. How long will both of them take to complete that work if they work together

?

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8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>EXERCISE>Q 4

A, B

and

C

working together can finish a piece of work in

4

hours.

A

alone can do it in

12

hours and

B

alone can do it in

10

hours, In how many hours will

C

alone do the same work

?

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8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>EXERCISE>Q 5

A

and

B

can do a piece of work in

10

days,

B

and

C

in

15

days and

C

and

A

in

12

days. In how many days can

A, B

and

C

finish it if they all work together

?

Also find the number of days

B

will require to finish the work if he works alone.

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8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>EXERCISE>Q 6

A

can do a piece of work in

12

days and

B

can do in

18

days. They worked together for

4

days when

A

fell ill and

B

had to complete the remaining work. In how many days was the work completed

?

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8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 22 - Time and Work>EXERCISE>Q 7

Two inlet pipes

A

and

B

can fill an empty cistern in

4

hours and

8

hours, respectively. If both are opened together in the empty cistern, how much time will they take to fill it completely

?