Question

A jet boat is used to take canoers 200 miles upriver to their starting point. As the driver of the jet boat, Jeremy knows that it will take him 5 hours to get the canoers upstream, but only 4 hours to get the boat back downstream after dropping the canoers off, as long as he keeps the boat moving at a constant speed.

How fast would the boat be moving in still water?
A.
5 mph
B.
40 mph
C.
45 mph
D.
50 mph

Answer 1

200/5 = 40 mph

200/4 = 50 mph
Let x be the speed in still waters and y the speed of current.


x + y = 50

x - y = 40

ADD 2x = 90

x = 45 mph

Answer 2

thank you so much , makes much more sense c: @Nurali

Answer 3

My Pleasure.

Answer 4

Welcome to Openstudy.

Answer 5

Rhnak you so much (: @Nurali

Answer 6

thank*