Question

A, B and C together take 8 min to address a pile of envelopes. a and b together would take 10 min; a and c together take 15 min. how long will each take working alone?
Please give a correct answer because my exam are near and if u don't know then answer pls leave cause its related for my future​

Answer 1

fAnswer

A,B,C working together complete a work in 8 hours.

∴ In one hour they can complete

8

1

th of work.

A can alone do the work in 20hr

∴ In one hour A can complete

20

1

th of work.

B can alone do the work in 24hr.

∴ In one hour B can do

24

1

th of work.

Let in one hour C can do

x

1

th of work.

∴

20

1

+

24

!

+

x

1

=

8

1

⇒

x

1

=

8

1

−(

20

1

+

24

1

)

=

8

1

−

20×24

44

=

8

1

−

120

11

=

120

15−11

=

120

4

=

30

1

∴ C can do the same work in 30 hours.

Answer 2

sandford can pick a basket of string beans in 40 minutes while jerome can do the same task in 30 min how long will it take them to pick a basket of string beans if they work together

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