Question 154429
a rectangular tank has a base area of 7000cm2. 2 taps are turned on at the same time to fill the tank. tap a can deliver 5 litres of water in 20 seconds. tap b can deliver 2.5 litres of water in 15 seconds.if the height measures 25cm, how long will it take to fill up the tank completely? 
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The volume is the area of the base times the height, or 7000*25 cc
V = 175000 cc (cubic centimeters) or 175 liters
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Tap A's flow is 5.0 liters in 20 seconds, or 15 l/min
Tap B's flow is 2.5 liters in 15 seconds, or 10 l/min
The sum is 25 liters/min.
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175 at 25/min will take 7 minutes, 175/25.