A fire truck attaches two fire hoses to a hydrant to fight a fire. each hose has a diameter of 20 cm. The underground water pipe going to the hydrant has a diameter of 100 cm. In the underground pipe, the water has a speed of 2.0 m/s.

(a) How many kilograms of water are put on the fire in 30 minutes.

(b) What is the speed of the water in the fire hoses?

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