Question

7 pipelines are required to fill a tank in 1 hour 30 minutes. How long will it take if only 5 pipelines of the same type are used? [ 2 MARKS ]

Answer 1

Understanding type of variation: 1 Mark
Solution: 1 Mark

Let the time required to fill the tank be d minutes.

Lesser the pipelines more will be the time required to fill the tank. So, this is an inverse proportion.

No.of pipes x time = constant

7 x 90 = 5 x d

d = 126 minutes