1.

8 pumps to to fill a tank in 1 hour 30 minutes. How long will it take, if only 6 pumps ?

Answer» `1/(8*3/2)=1/(6*t)`
`1/12=1/(6t)`
`t=2hour`
8 pumps fill in 3/2 hours=1tanks
1 pump fill in 1 hours=`1/(8*3/2)=1/12`
6 pump fill in 1 hour=`1/12*6=1/2`
t=2hours.


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