2006-09-20 09:35:54 · 12 answers · asked by Whitey 1 in Science & Mathematics ➔ Mathematics
OK, 1 knot is 1.853 kilometres. The return journey took 18 hours at an average speed of 9 knots, urgo he went the distance of 162 knots, or 300.186 kilometres.
Since he did the journey twice (there by plane, back by boat), he did a total of 600.372 kilometres. Since the total time taken was 20 hours, he did an average speed of 30.0186 km p/h
Call it 30 km p/h in round figures.
2006-09-20 09:46:52 · answer #1 · answered by chris_ninety1 5 · 0⤊ 0⤋
time for the to journey=2hrs
time for the fro journey=18hrs
distance=2*18*9
average speed for the round trip=2*18*9/20=16.2 knots/hour
2006-09-20 16:44:48 · answer #2 · answered by raj 7 · 0⤊ 0⤋
ok, first, I'm assuming that "km p/h" really means "hm/h". The / means per.
anyway, we can calculate the total distance from the "sailing back" part. velocity = distance / time. 9=x/18. x=152 nautical miles.
*2 to get the total trip = 304 nautical miles.
total time was 2 hours + 18 hours.
again, velocity = distance / time. so 304/18. = 16.89 knots.
1 knot = 1.852 kph
therefore, the average speed was 31.27 km/h.
2006-09-20 16:46:03 · answer #3 · answered by wilburrr 2 · 0⤊ 0⤋
You need to know the speed of the plane, add both speeds up and divide by 2. A plane speed can be measure in knots also but mph or kph and knots are the same.
2006-09-20 16:39:31 · answer #4 · answered by tucksie 6 · 0⤊ 0⤋
distance travelled is (18 x 9) x 2
18 hours sailing time at 9 kts, x 2 round trip
ie round trip is 324 nautical miles
divide that by .5396 to convert to kilometeres ~ 600 Km
divide that by 20 (18+2 hours traveltime) ~ 30kmh
2006-09-20 16:54:11 · answer #5 · answered by Mark J 7 · 0⤊ 0⤋
tucksie is wrong.
I'm not sure what a knot is, i'll assume it's 9 mph so about 5.625 km/h.
so distance from A to B = 5.625 x 18 = 101.25 km.
so total distance = 2 x 101.25 = 202.5
total time = 2 + 18 = 20 hrs.
average speed = total distance/total time = 202.5/20 = 10.125 km/h = 16.2 knots.
2006-09-20 16:45:28 · answer #6 · answered by THJE 3 · 0⤊ 0⤋
18 hours at a speed of 9 knots means 16.668Km/h in 18hrs.
so you traveled 300.024km to come back. I suppose the distance is the same on ground and in the air this means you travelled 600.048km total.
2 hrs to go and 18hrs to come back
so you traveled at 30.0024km/h, let's say 30km/h.
2006-09-20 17:01:03 · answer #7 · answered by Abs 1 · 0⤊ 0⤋
16.2 Knots Per Hour
2006-09-20 23:02:43 · answer #8 · answered by Tropic-of-Cancer 5 · 0⤊ 0⤋
a plane took 2 hrs, sailed back! did it crash in the sea?
2006-09-20 20:11:16 · answer #9 · answered by mitch 1 · 0⤊ 0⤋
as fast as a 3 legged fox with a back wind, hope this helps
2006-09-20 16:49:01 · answer #10 · answered by buelly 2 · 0⤊ 0⤋