Question
Victoria has a boat that can move at a speed of 20km/h in still water. She rides 140km downstream in the same time it takes 35km upstream. What is the speed of the river?
Answers
Steve
time = distance/speed
If the river's speed is r,
140/(20+r) = 35/(20-r)
r=12
check:
140/32 = 35/8
If the river's speed is r,
140/(20+r) = 35/(20-r)
r=12
check:
140/32 = 35/8