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A boat traveled upstream a distance of 90 miles at an

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Director
Joined: 11 Sep 2006
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A boat traveled upstream a distance of 90 miles at an [#permalink]

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21 Oct 2006, 09:50
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A boat traveled upstream a distance of 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an avg. speed of (v+3) miles per hour. If the trip upstream took 1/2 an hour longer than the trip downstream, how many hours did it take the boat to travel downstream?

2.5
2.4
2.3
2.2
2.1
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22 Oct 2006, 18:32
1
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t1=0.5+t2
90/(v-3) - 90/(v+3)=0.5

v=33

Time for downstream travel is 90/(33+3) =2.5
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22 Oct 2006, 17:38
Anybody?? Pleeeeeeeeze?
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22 Oct 2006, 18:04
2.5?

v-3 = 90/ t1
v+3 = 90/t2

t1-t2 = 1/2

three equations three variables
Director
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23 Oct 2006, 06:22
OA was 2.5. Thanks!
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23 Oct 2006, 06:22
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A boat traveled upstream a distance of 90 miles at an

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