Question 14
Three beaver villages A, B, C lie beside the gray river. Black tributary streams flow into it. Beavers travel along the banks, crossing streams and, if useful, the river. Each river crossing takes 2 minutes; each stream crossing takes the number of minutes written beside it. For example, the dashed A-to-B route takes 7 minutes of crossing time.
What is the least total crossing time, in minutes, for a trip from A to C along the riverbanks?
What is the least total crossing time, in minutes, for a trip from A to C along the riverbanks?