The cross-section of a cannel is a trapezium in shape. If the cannel is 11 m wide at the top and 9 m wide at the bottom and the area of cross-section is 960 sq m, the depth of cannel is?	Select.
A) 69  B) 92  C) 94  D) 49  E) 96
1/2 * d (11 + 9)   = 960   d = 96   Answer: 96
<result>E</result>
The cross-section of a cannel is a trapezium in shape. If the cannel is 11 m wide at the top and 9 m wide at the bottom and the area of cross-section is 960 sq m, the depth of cannel is?