ANS:D - 12
Let the required number of working hours per day be x.
More pumps, Less working hours per day (Indirect Proportion)
Less days, More working hours per day (Indirect Proportion)
Pumps |
4 |
: |
3 |
|
:: 8 : x |
Days |
1 |
: |
2 |
4 x 1 x
x = 3 x 2 x 8
x = |
(3 x 2 x 8) |
(4) |
x = 12.