Question

Marcus can drive his boat 36 miles down the river in 3 hours but takes 4 hours to return upstream. Find the rate of the boat

in still water and the rate of the current.

Answer 1

speed in still water: 10.5 Current: 1.5

Explanation:

Answer 2

With river 12 miles per hour

Against river 9 miles per hour

wv = water velocity vsw = boat velocity in still water

vsw +wv = 12 mph

vsw -wv = 9 mph

2 * vsw = 21 mph

boat velocity in still water = 10.5

Since vsw + wv = 12 then

water velocity = 1.5 mph

Explanation: