Question

5 pipes are required to fill a petrol tank in 2hrs. How long will it take if only 4 pipes of the same type are used.

Answer 1

Answer:

2.5 hrs.

Step-by-step explanation:

Given :-

5 pipes connected to a tank

The pipes fill the tank in 2 hrs.

To find :-

Time taken by 4 pipes of the same types to fill that petrol tank

Solution :-

(By unitary method)

∵ Time taken by 5 pipes to fill the tank = 2 hrs.

∴ Time taken by 1 pipe to fill the tank = 5*2 hrs.

∴ Time taken by 4 pipes to fill the tank = (5*2)/4

                                                                 = 10/4

                                                                 = 2.5 hrs.

Hence, 4 pipes of the same type will fill that petrol tank in 2.5 hrs.