They returned over the same road and averaged 48 km/h. If the round-trip took 3 h, how many kilometres did they travel in all? Show the steps of your answer
2007-04-17 15:39:43 · 2 answers · asked by .·´¯`·-> вавіі-ѕнаz <-·´¯` 2 in Education & Reference ➔ Homework Help
48t = 60(3-t)
48t = 180 - 60t
108t = 180
t = 1 2/3hr = 1 hr, 40 min @40 km/h
3-t = 1 1/3 hr = 1 hr, 20 min @ 60km/h
(4/3)60 = 80 km one way
(5/3)48 = 80 km return (if not the same, start over)
80+80 = 160km total
2007-04-17 15:50:08 · answer #1 · answered by Steve A 7 · 0⤊ 0⤋
180km
I'm not too sure how to work it out though. I kind of did trial and error.
Total time=180min
I then tested 80min at 60km/h and got 80km
As a result, it is clear that I then did 100min at 48km/h and got 80km
So as you can see 80 + 80 = 160km/h and it took 180min (3hours) to travel. Hope it helps. Sorry about my working.
2007-04-17 22:54:19 · answer #2 · answered by Anthony 4 · 0⤊ 0⤋