2006-10-09 22:54:53 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Speed = distance / time
= 15km / 20 minutes
= 0.75km / minutes
= 0.75km / minutes x 60minutes
= 45km / hour
=12.5m/s
=28miles/h
2006-10-09 23:32:48 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Speed of travelling is generally expressed in Kilometers per hour. So we have to find the distance travelled in 1 hr. i.e. 60 minutes.
Now in 20 minutes the distance travelled is 15 kilometers. So in 60 minutes the distance travelled will be 15*60/20 = 45 Kilometers. The speed of travel is 45 kilometers per hour.
2006-10-09 23:36:47 · answer #2 · answered by Manindomb 2 · 0⤊ 0⤋
You have done 15 kilometers in 20 minutes: the speed is just the distance you travel per unit of time. Let's take the minute as the unit. In one minute you will travel:
15/20=1x
x=0.75
You have done 0.75 kilometers per minute. That is your speed.
2006-10-09 23:14:00 · answer #3 · answered by Arc 2 · 0⤊ 0⤋
D=rt
15=r(1/3) time must be in hours, 20 minutes is 1/3 of an hour
45=r
rate is 45 km/h
2006-10-10 06:56:28 · answer #4 · answered by mom 7 · 0⤊ 0⤋
when some one drives in 20 minutes 15 kilometers , it means that in 60 min ( three times 20 minutes) he drives 45 km per hour
2006-10-09 23:24:51 · answer #5 · answered by Curious 2 · 0⤊ 0⤋
45 km/hour
15 km/20 minutes x 3 = ?
15 km x 3 = 45 km
20 minutes x 3 = 1 hour.
15 km/20 minutes x 3 = 45 km/hour.
:)
2006-10-09 23:04:33 · answer #6 · answered by DWReyes 3 · 1⤊ 0⤋
45 kilometers per hour
2006-10-09 23:11:19 · answer #7 · answered by gnu1968 1 · 0⤊ 0⤋
50 km per hour is the speed.
2006-10-09 23:01:31 · answer #8 · answered by redacatfish 2 · 0⤊ 1⤋
45 kilometers per hour.
2006-10-10 07:55:27 · answer #9 · answered by CSUFGrad2006 5 · 0⤊ 0⤋
v = d/t
v = 15 km/20min
v = 0.75 km/min
or you may answer it in m/s
v = 0.75 km/min x 1 000 km / 60 s
v = 12.5 m/s
2006-10-10 00:12:54 · answer #10 · answered by MITIJAH 1 · 0⤊ 0⤋