The plane returns home, over exactly the same distance, at 331 mph. What is his average speed over the entire journey?
2007-01-27 10:17:05 · 9 answers · asked by sunsworth1975 1 in Social Science ➔ Other - Social Science
496.5 mph
2007-01-27 10:23:05 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The common assumption to make with a question like this is to add the two speeds and halve them. So 993+331= 1324. Divide it by 2, and the average is 662mph, right? WRONG.
For the sake of simplicity. let's say the trip is 993 miles.
The outward journey at 993mph would take an hour. (Time = distance /speed, so 9993/993=1)
The return journey at 331 mph would take 3 hours. (993/331=3)
Speed is calculated by distance divided by time.
The plane has covered a total distance of (2x993) miles in (1+3) hours. That's 1986 miles in 4 hours.
1986 divided by 4 is 496.5 miles per hour average speed.
2007-01-27 12:12:22 · answer #2 · answered by Andrew B 6 · 0⤊ 0⤋
Spose it cud be 662 mph, (993 + 331) divided by 2.
2007-01-27 10:26:55 · answer #3 · answered by shyped 2 · 1⤊ 1⤋
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2016-12-03 03:10:58 · answer #4 · answered by ? 4 · 0⤊ 0⤋
The question makes no sense.
We discuss the speed at which a plane is travelling.
You then ask what is HIS average speed.
Who is HE. !!!!! Rudolph !!!!!
496.5 is the answer if the question is about Rudolph.
2007-01-27 11:12:59 · answer #5 · answered by angie 5 · 1⤊ 0⤋
Amended: 496.5 mph.
2007-01-27 10:34:18 · answer #6 · answered by Polo 7 · 1⤊ 0⤋
u shuld do ur own homework....this way u wont learn :(
and wt is da distance?
to get average speed divide total distance by total time
2007-01-27 10:20:41 · answer #7 · answered by YAHOO! Answers 4 · 0⤊ 1⤋
My Brain hurts!
2007-01-27 10:25:33 · answer #8 · answered by Anonymous · 0⤊ 1⤋
187.3 ms-1
2007-01-27 10:21:44 · answer #9 · answered by LordLogic 3 · 0⤊ 1⤋