Problema Solution
Fran swims at a speed of 2.3 km/h in still water. the lazy river flows at a speed of 0.6 km/h. How long will it take fran to swim 6 km upstream?
Answer provided by our tutors
let
v = 2.3 km/h Fran's speed in still water
r = 0.6 km/h the speed of the river
d = 6 km the distance
t = the time of the swim
when swimming upstream Fran's speed is: v - r = 2.3 - 0.6 = 1.7 km/h
since speed = distance/time follows time = distance/speed
t = d/(v - r)
t = 6/1.7
t = 3.53 hr
It will take 3.53 hours for Fran to swim 6 km upstream.