1.

6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only 5 pipes of the same type are used?

Answer» let time required be `= x`
given 6 pipes require`= 60 + 20`mins
`= 80mins`
1 pipe requires `= 80/6`
5 pipe requires = `80/6*5`
` = 66.66 mins `
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