On a topographical map of 1:50,000 scale, the contour interval is 10 metres. Place A is on a contour of 200 m and place B on a contour of 240 m, and the distance between A and B on the map is 4.0 cm. The correct gradient between A and B would be
A1 in 30
B1 in 40
C1 in 50
D1 in 60
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