SOLUTION: A tank is having 6000 liters of water need to be drained. The draining rate is 1liter per 60sec through 1st valve & 1 liter per 15 sec through the 2nd valve. How many hours will

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Question 839194: A tank is having 6000 liters of water need to be drained. The draining rate is 1liter per 60sec through 1st valve & 1 liter per 15 sec through the 2nd valve. How many hours will it take to drain the tank ?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Not said how the valves are used, maybe both are used simultaneously to drain the 6000 liters. The rates are combined using addition.

%281%2F1%2B1%2F%281%2F4%29%29=5%2F4 liters per minute.
This is %285%2F4%29%2A60=75 liters per hour.

Let t = How many hours to drain the 6000 liters of water.
highlight%2875%2At=6000%29
Solve for t