# Problem of the Week Problem C Crossing Canals

Koji is rowing his boat on a busy canal system near his home. The following diagram shows the canal system with a star representing Koji’s current location and the house representing the location of his home.

From Koji’s extensive canal experience, he knows the following:

1. Rowing straight across an intersection square takes $$30$$ seconds.

2. Rowing straight across a square that is not an intersection takes $$20$$ seconds.

3. Turning right at an intersection takes $$15$$ seconds.

4. Turning left at an intersection takes $$270$$ seconds, due to heavy traffic.

5. It is not possible make U-turns or reverse direction.

Calculate the shortest amount of time it will take Koji to row home from his current position, using only the canals shown.