Answer:
706 meters
Explanation:
An arch bridge crosses a river. The bridge is supported at each end and has seven additional supports in the water. The span of each arch is 86 meters, and the width of each support at the base is 2 meters. What is the distance across the river?
Given that :
Total number of supports on the bridge = 1 at both end + 7 additional = (1 + 7 + 1) = 9 supports
Span of arch = 86 meters
Arch lies in between two successive supports ;
Hence, number of archs = 8
Hence, width of arch = (8 * 86) = 688 meters
Width of support = 2 meters
Total width of support : (2 * 9) = 18 meters
Hence, total distance of bridge :
Total arch width + total support width
(288 metres) + (18 meters) = 706 meters