Question

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot. Coming back later in the day, at

the same boat speed, took her 10 min. If the current in that part of the river is 6 km per hr, what was her boat

speed in still water?

Answer 1

Explanation:

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot. Coming back later in the day, at

the same boat speed, took her 10 min. If the current in that part of the river is 6 km per hr, what was her boat

speed in still water?

Let b+6 be downstream rate.

and b-6 be upstream rate.

Distance up = Distance down = (rate)(time)

(b+6)(1/6 hr) = (b-6)(1/2 hr)