a motorist travells from town A to town B 145km distance in 3 hours & 45 minutes. find his speed in km per hour & B in meters per second
2006-09-19 12:22:24 · 7 answers · asked by Babyphat 1 in Science & Mathematics ➔ Physics
3 hours and 45 min is 225 mins
1 min is 60 seconds
1 hour is 60 min
1 kilometer is 1000 meter
so:
145 km/225 min x 60min/ 1 hr = 38.67 km/hr
then
145km/225 min x 1 min/ 60 sec x 1000 m/ 1 km = 10.74 m/sec
2006-09-23 12:12:34 · answer #1 · answered by Jaimelson C 2 · 0⤊ 0⤋
km/hr is kilometers divided by hours. In this case you'd use 145 for kilometers, and 3.75 since 3 hours and 45 minutes is 3 and 3/4th of an hour. That gives you 38.667 km/hr. To convert that to m/s, there are 1000 meters in a kilometer, so multiply by 1000. There are 3600 seconds in an hour, so divide that by 3600. It doesn't matter if you multipy your original data, or your final answer it will all come out the same. You should get 10.74 m/s for B.
2006-09-19 19:32:40 · answer #2 · answered by Zambartas 1 · 0⤊ 0⤋
a km is .6 of a mile
2006-09-19 19:27:37 · answer #3 · answered by Wayne A 5 · 0⤊ 0⤋
Do your own home work.. You can find converter just by searching yahoo.
2006-09-19 19:31:11 · answer #4 · answered by Don K 5 · 1⤊ 0⤋
38.67 km/h
10.74 m/s
I think those are the answers.
2006-09-19 19:29:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
38.6 km/ hr
10.7 m/s
2006-09-19 19:27:19 · answer #6 · answered by Anonymous · 0⤊ 0⤋
yeah, find it
2006-09-19 19:27:42 · answer #7 · answered by Caveman 4 · 0⤊ 0⤋