The cross-section of a cannel is a trapezium in shape. If the cannel is 14 m wide at the top and 4 m wide at the bottom and the area of cross-section is 380 sq m, the depth of cannel is? Choose the most appropriate option:	A) 39	B) 28	C) 27	D) 42	E) 71
1/2 * d (14 + 4) = 380   d = 42   Answer: 42
<result>D</result>
The cross-section of a cannel is a trapezium in shape. If the cannel is 14 m wide at the top and 4 m wide at the bottom and the area of cross-section is 380 sq m, the depth of cannel is?