3.27 Hours
The only way to solve this is to go upstream to the source and down the other bank! This is not a well-known ploy and you should be able to win some bets... See attached link.
The number of digits in the coefficient should be exactly the same as the number of significant figures.
one second for every ten feet of your vehicle length
3.27 hrs
You are traveling upstream on a river at dusk. You see a buoy with the number 4 and a flashing red light. What should you do?
Since this is a Green Lighted Buoy sighted while approaching a harbour,this is a Lateral port hand side mark, IALA region B. To keep this buoy on your port side while travelling upstream.
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
If you are traveling upstream on a river and see a red triangular daymark, you should pass this marker on the left side.
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
When traveling upstream on a river you see a red triangular daymark, so you should pass on the left side.
One prolonged blast every two minutes
When heading upstream green buoys should be on the left/port side of the boat . The opposite is true when traveling downstream.
::Keep the marker on your starboard (right) side
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?
Keep a green lateral marker to your left, or port, side when proceeding in the upstream.
Keep it on your left when heading upstream