Question

9 pumps of equal capacity can empty a tank in 36 mins how long will it take to empty the tank if 5 pumps out of these were switched off

Answer 1

Answer:

1hr 21min

Step-by-step explanation:

Let the total time taken be x

x1y1=x2y2

9*36=(9-5)*x

9*36=4x

9*36/4=x

81=x

so it will take 81 min =1hr 21min

Answer 2

Hope you will find it easy