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airplanes
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| A weather service plane flew 2100 km/h with the jet stream as a tailwind and back again. The eastbound flight took 3 hrs and the westbound one took 4 hrs and 12 minutes. Find the speed of the jet stream and the air speed of the plane |
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Re: airplanes
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by
on 2006-11-20 19:44:24 |
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1500=plane 600=jet stream that is assuming you weren't being completely vague and the average speed of the plane was 2100 in both directions. |
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Re: airplanes
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by MiCHiYo μ
on 2006-11-20 19:58:35
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d-ninja, is it possible for you to show your workings? because, with the use of s=d/t, i got the plane for 700. and, how do you get a different air speed for the jet stream? if the jet stream decreases the speed of the plane by 30 minutes... okay. i am lost in translation. -michiyo- 
 beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: airplanes
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I'm assuming the jetstream was with the plane on the eastbound, and against it on the westbound. The whole trip is 6300 km. 3 hours on the eastbound gives 2100 km/h (given). 4.2 hours on the westbound gives 1500 km/h. So, 2100-1500=600. But, D-ninja, on the way there it was with the plane and on the way back it was against. So we have to divide 600 in 2, leaving 300 km/h as the speed of the jetstrem. Therefore, "jetstream" + "plane" = 2100 300 + "plane" = 2100 "plane" = 2100 - 300 The plane was moving at 1800 km/h **(double-proof)** "plane" - "jetstream" = 1500 "plane" - 300 = 1500 "plane" = 1500 + 300 "plane" = 1800 km/h Plane airspeed is 1800 km/h Jetstream speed is 300 km/h
Wise Man says: "Take a dog off its leash and it will wander."
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Re: airplanes
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by MiCHiYo μ
on 2006-11-23 03:08:27
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okay... i did my very best to work this one out, and i didn't get anywhere near any of the answers given, so i decided to unlock the thread and plaster my workings. it get's me bogged down if i don't at least try, so here it is. if someone could comment on this, please do.  -michiyo-
beware. the QueeN oF SiGGieS is here. kill that mr. scrolly or your siggy goes BAI BAI. it's solidarity month! let's be united! +[-- GeNDouNiaNS: i am half-back! visit my blog by clicking on the siggie banner! updated: 12.07.07 --]+
~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: airplanes
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by
on 2006-11-23 06:18:39 |
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The plane travels at 2100km/h, so the the distance from A to B is 6300. Also when you divided by 180 your answer should be in km/minute. Other than those two errors, it's done correctly. You did it right, with the wrong stuff. |