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? Pick one
A) 29 B) 19 C) 17 D) 80 E) 14
1/2 * d (10 + 6) = 640   d = 80   Answer:80
<result>D</result>
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?