Problema Solution
it took a crew 4 h and 30 min to row 6 km upstream and back again. if the rate of flow of the stream was 1 km/h what was the rowing speed of the crew in still water?
Answer provided by our tutors
First, lets write some equations from the given information using the general equation D=RT (distance=rate*time):
Upstream:
6km=(r-1)(t)
Where 'r' is the rate of the boat in still water and 't' is the time to go upstream.
Downstream:
6km=(r+1)(4.5-t)
Where 'R' is the rate of the boat in still water and '4.5-t' is the time to go downstream
Solving for r, we get:
r=3mph