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1. |
The cross-section of a cannel is a trapezium in shape. If the cannel is 10 m wide at the top and 6 m wide at the bottom and the area of cross-section is 640 sq m, the depth of cannel is_________? |
A. | 20 m |
B. | 60 m |
C. | 40 m |
D. | 80 m |
Answer» E. | |