A plane took 3 hours 15 minutes to return to Spain.
The length of this journey was 2350km.
Calculate the average speed of the plane ins
1. Kilometres per hour,
2350/3.25 = 723
(how come it's 3.25?)
2007-11-04 06:43:09 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
speed = distance / time
distance = 2350 km
time = 3 ¼ hours = 3.25 hours
speed = 2350 / 3¼ km /h
speed = 9400 / 13 km / h
speed = 723.1 km / h (to 1 dec. place)
2007-11-04 10:37:23 · answer #1 · answered by Como 7 · 1⤊ 1⤋
The 3.25 is three hours and 15 minutes (15 is one quarter of 60).
rate = distance/time
r=2350/3.25
r=723
The plane flew at an average of 723 kilometers per hour.
2007-11-04 06:53:18 · answer #2 · answered by horsesarah12 3 · 0⤊ 0⤋
An hour is made up of 60 minutes. 15 minutes is one quarter hour or .25 of an hour. when you write something in decimal form it is per hundred. Minutes are only per 60. so write out the equation
x/100=15/60
cross multiply
15 times 100=60x
1500=60x
1500/60=x
25=x
x is now per hundred, so..
x=25/100 or .25
2007-11-04 06:55:49 · answer #3 · answered by Anonymous Me 2 · 0⤊ 0⤋
d=rt
2350=3.25x
2350/3.25=x
723.08=x
3 and 1/4 hours
2007-11-04 06:47:00 · answer #4 · answered by roguetrader12002 4 · 0⤊ 0⤋
15 min is 15/60 of an hour = 0.25
2007-11-04 06:52:36 · answer #5 · answered by norman 7 · 0⤊ 0⤋
First of all.. the speed of airplanes is measured in KNOTS and not Kilometers per hour
2007-11-04 06:51:24 · answer #6 · answered by Anonymous · 0⤊ 0⤋