In a tank of capacity 4200 liters, a total of 7 pipes are attached. Some of them fill the tank at 4 liters per minute while others at 11 liters per minute. It takes a total of 1 hour and 40 minutes to fill the tank if all pipes are opened. How may pipes have a rate of flow of 4 liters per minute?

In a tank of capacity 4200 liters, a total of 7 pipes are attached. Some of them fill the tank at 4 liters per minute while others at 11 liters per minute. It takes a total of 1 hour and 40 minutes to fill the tank if all pipes are opened. How may pipes have a rate of flow of 4 liters per minute?
1). 2
2). 3
3). 4
4). 5

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