The cross-section of a stream is a trapezium in shape. If the stream is 10 m wide at the top and the area of cross-section is 640 sq m, the depth of stream is 80m and width at the bottom is? Answers:
A) 2 m B) 6 m C) 4 m D) 8 m E) 9 m
1/2 * 80 (10 + b) = 640   b = 6m   ANSWER:6 m
<result>B</result>
The cross-section of a stream is a trapezium in shape. If the stream is 10 m wide at the top and the area of cross-section is 640 sq m, the depth of stream is 80m and width at the bottom is?