Suppose you can paddle a canoe in still water at 5km/h and that you are going to travel 6km up a river and 6km back. If the river current is 1km/h, find your total time and your average speed for the round trip.
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v + c = 5 + 1 = 6
v - c = 5 - 1 = 4
d = vt
t = 6/6 + 6/4 = 2.5 hrs total trip
Avg speed = total distance/total time
= 12/2.5 = 4.8 km/hr
v - c = 5 - 1 = 4
d = vt
t = 6/6 + 6/4 = 2.5 hrs total trip
Avg speed = total distance/total time
= 12/2.5 = 4.8 km/hr