1.

5 bibes are required to fill a petrol tank in a hours 20 minuts. How long will it take for 8 pipes of the some type are used?​

Answer»

We can SEE that if the NUMBER of pipes increases, the time decreases.

So, inverse proportion is in action here. So,

5pipes=1hr 20 min=80 min[1hr=60min]

1 pipe=5×80 mins.

So,

8pipes=(5×80)÷8mins=50mins

So,

8 pipes will fill the tank in 50 mins. or 5/6 hr.

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