Question

:A can
do a work in 15 days and B in 20 days. If the work on it together for 4 days, then the fraction of work that is left is ​

Answer 1

Volume of pit = Volume of soil on land

⇒π(

2

7

)

2

=22×14×h

so, h=

7

22

×

2

7

×

2

7

×20×

22

1

×

14

1

h=

2

5

=2.5m

Hence, the answer is 2.5m.