The calculated distance (air line) between Banjul NDing and Sinchu Balla is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Sinchu Balla is certainly longer, as only the direct route (as the crow flies) between Banjul NDing and Sinchu Balla has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles