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1. |
Water flows in a tank\[150\,m\,\times \,100\,m\] mat the base, through a pipe whose cross-section is 2 dm by 1.5 dm at the speed of 15 km per hour. In what time, will the water be 3 metres deep? |
A. | 50 hours |
B. | 150 hours |
C. | 100 hours |
D. | 200 hours |
Answer» D. 200 hours | |