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A boat covers a distance of 16 km in 2 hours when rowing downstream an

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 61385
A boat covers a distance of 16 km in 2 hours when rowing downstream an  [#permalink]

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New post 10 Jan 2020, 03:39
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

67% (01:15) correct 33% (02:20) wrong based on 12 sessions

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Director
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Joined: 25 Jul 2018
Posts: 560
Re: A boat covers a distance of 16 km in 2 hours when rowing downstream an  [#permalink]

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New post 10 Jan 2020, 03:50
V —speed of the boat
x— speed of stream
What is the speed of the boat in still water?(V—???)

(V +x)*2 = 16
(V—x)*4= 16
—> V+ x = 8
—> V—x= 4
2V= 12 —> V=6

The answer is C

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Joined: 26 Mar 2019
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Re: A boat covers a distance of 16 km in 2 hours when rowing downstream an  [#permalink]

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New post 10 Jan 2020, 05:01
Downstream speed = 16/2 = 8 kmph

Upstream speed = 16/4 = 4 kmph

Speed of boat = (DS + US)/2 = (8 + 4)/2 = 6 kmph.

As additional infornation :

Speed of stream = (DS - US)/2 = (8 - 4)/2 = 2 kmph.
GMAT Club Bot
Re: A boat covers a distance of 16 km in 2 hours when rowing downstream an   [#permalink] 10 Jan 2020, 05:01
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A boat covers a distance of 16 km in 2 hours when rowing downstream an

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