The time t required to empty a tank varies inversly as the rate r of pumping. If a pump can empty a tank in 35 min at the rate of 800kL per minute, how long will it atake the pump to empty the same tanks at the rate of 1400kL per minute?

It will take the pump 20 min

Step-by-step explanation: Please see the attachments below

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540