 Hello and how are you all today? My name is Priyanka and let us discuss this question. It says water is flowing at the weight of 15 km per hour through a pipe of diameter 14 cm into a rectangular tank which is 15 m long and 44 m wide. Find the time in which the level of water in the tank will rise by 21 cm. So let us proceed with the solution to this question. First of all we will find out volume of water flowing through the cylindrical pipe in one hour. 10 km that is 15,000 m per that is equal to 22 by 7 into radial that is 7 cm by 100 to make it into meter into 7 by 100 into 15,000 m that is cube meter cube. This is because since the diameter is 14 cm therefore radius will be 7 upon 100 m. That is coming out to be 231 meter cube. Now this 231 meter cube of water will fall into the tank in one hour right? Since the level of water in the tank is required to be raised by 21 cm that is 21 by 100 volume of water required in the tank will be volume of required quantity of water that will be equal to it is 50 m long 44 m wide into it should be raised by 21 cm so it will be 21 by 100 right? That is equal to answer will be meter cube that is equal to 154 into 3 meter cube that is 462 meter cube. Now since this 231 meter cube of water falls into the tank in one hour therefore 462 meter cube of water will fall into the tank in the time required is equal to 462 meter cube of water or let us write it as 462 upon 231 hours that is coming out to be 2 hours right? So this is the required answer to the session. So hope you understood the whole concept well and enjoyed it too. Have a nice day ahead.