The speed of a boat that travels 10 miles in 30 minutes is 1/3 miles per minute.
Formula
s=d/t
s=10/30
s=1/3 mile per minute
Let boat speed = X and current speed = Y Downstream speed = boat speed plus current speed = X + Y Upstream speed = boat speed minus current speed = X -Y Downstream speed = 2 miles divided by 3 minutes = 2/3 miles per minute Upstream speed = 2 miles divided by 15 minutes = 2/15 miles per minute X + Y = 2/3 X - Y = 2/15 add equations 2X = 2/3 + 2/15 = 10/15 + 2/15 = 12/15 = 4/5 divide by 2 X = 4/10 = 2/5 use second equation and find Y as X -Y = 2/15 2/5 - Y = 2/15 6/15 - Y = 2/15 Y = 4/15 = current speed = 0.266 miles per minute
If the miles are nautical ones, then it takes (3)/(the boat's speed in knots) hours. If the miles are statute ones, then it takes (2.6053)/(the boat's speed in knots) hours.
30 km/h
Time = Distance/Average speed = 115/100 = 1.15 hours or 1 hour and 9 minutes.
Boat WRT land, downstream 10 + 8 = 18 KMH Boat WRT land, upstream 10 - 8 = 2 KMH Boat WRT water 10 KMH
It would be 20 MPH.
The average speed is(4 x the number of nautical miles the boat traveled in that time) knots.
5580+1/3
Time = Distance/Speed = 10 miles/20 miles per hour = 0.5 hours or 30 minutes.
25 miles.
5 miles
11 mph
hm
25 miles
Information about the speed of the car provides no information whatsoever about the speed of a boat!
Let boat speed = X and current speed = Y Downstream speed = boat speed plus current speed = X + Y Upstream speed = boat speed minus current speed = X -Y Downstream speed = 2 miles divided by 3 minutes = 2/3 miles per minute Upstream speed = 2 miles divided by 15 minutes = 2/15 miles per minute X + Y = 2/3 X - Y = 2/15 add equations 2X = 2/3 + 2/15 = 10/15 + 2/15 = 12/15 = 4/5 divide by 2 X = 4/10 = 2/5 use second equation and find Y as X -Y = 2/15 2/5 - Y = 2/15 6/15 - Y = 2/15 Y = 4/15 = current speed = 0.266 miles per minute
The rate of crossing depends on the speed the boat is traveling, not on the distance it has to travel. 25 miles could probably be crossed in approximately forty-five minutes or less.