Question

21 pumps can empty a water tank in 36 hours. how many hours would 56 pumps take to do the same work. it is question of direct and inverse variations.and and. is 13 hours 30 min.​

Answer 1

Solutions :-

Given :
21 pumps can empty a water tank in 36 hours.

Let the time taken by 56 pumps be x

Find the time taken by 56 pumps to do the same work :-

=> 21 × 36 = 56 × x
=> 756 = 56x
=> 756/56 = x = 13.5


Hence,
56 pumps take 13.5 hours or 13 hours and 30 minutes to do the same work.

Answer 2

Hello there!

        Given that,

21 pumps can empty a water tank in 36 hours

Let the time taken by 56 pumps be Y

Therefore,

=21 *36 = 56* Y

= 56y = 756

= 756/56

               y = 13.5 hrs

       

     

13.5 in Minutes = 13 hours 30 minutes

-------------------------------------

Therefore,

                  56 pumps take 13 hours and 30 minutes to do the same work.