Two points on a river are 10.4km apart and one stands 400...
Two points on a river are 10.4km apart and one stands 400metres above the other. What is the gradient along the river between the points?
1 in 20
1 in 24
1 in 26
1 in 32
1 in 36
Correct answer is D
No explanation has been provided for this answer.
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