jill went up a ski lift at 6 kilometers per hour. she skied back down at 34 kilometers per hour. the roundtrip took 30 minutes. how far did she ski for and how long?
i had this question on a test and i didn't get how to solve it. PLEASE help =]]
2006-12-03 14:53:57 · 4 answers · asked by michelle w 1 in Education & Reference ➔ Homework Help
In the time given she must travel as far at 6 km as she does at 34KM with in the 30 min
Let t= time traveled at 34KM
0= 40KM(t)- 6KM(30min-t)
0= 40Km(t)- 180KMmin +6(t)
0= 46KM(t)-180KmMin
180Knmin= 40Km(t)
t= 4.5 min
since we need hours
4.5min/60min/hr=-.075hr
34km/hr*0.75hr=2.55KM
2006-12-03 15:21:12 · answer #1 · answered by shadouse 6 · 0⤊ 0⤋
i know the second part is she skid 17 kilomiters because if she skid for 34 km's the trip would have been an hour but it only took 30 mins so you half the 34 wich is 17 so she skid 17 km's but as for adding the first part of the question i dont see how it can be possible
2006-12-03 23:01:06 · answer #2 · answered by liam_jones_10_10 2 · 0⤊ 1⤋
Average it. it takes 6km/hr to go up. 34km/hr to go down.
To average, you add this and divide by two.
40/2=20.
Her average was 20km/hr and she skied for 30 minutes(half hour). so 20kmhrs x 0.5 hrs= 20/2 which equal 10km
She skied 10km and for 30minutes(roundtrip)
2006-12-03 22:55:19 · answer #3 · answered by Abdul Ali Jakeer 2 · 0⤊ 1⤋
went up for 25min which is 2.5km and come down for 5min which is 2.83km
2006-12-03 23:00:30 · answer #4 · answered by Fish Master 5 · 0⤊ 1⤋