2011 AMC 12A Problems/Problem 12: Difference between revisions
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== Problem == | == Problem == | ||
A power boat and a raft both left dock <math>A</math> on a river and headed downstream. The raft drifted at the speed of the river current. The power boat maintained a constant speed with respect to the river. The power boat reached dock <math>B</math> downriver, then immediately turned and traveled back upriver. It eventually met the raft on the river 9 hours after leaving dock <math>A.</math> How many hours did it take the power raft to go from <math>A</math> to <math>B?</math> | |||
<math> | |||
\textbf{(A)}\ 3 \qquad | |||
\textbf{(B)}\ 3.5 \qquad | |||
\textbf{(C)}\ 4 \qquad | |||
\textbf{(D)}\ 4.5 \qquad | |||
\textbf{(E)}\ 5 </math> | |||
== Solution == | == Solution == | ||
== See also == | == See also == | ||
{{AMC12 box|year=2011|num-b=11|num-a=13|ab=A}} | {{AMC12 box|year=2011|num-b=11|num-a=13|ab=A}} | ||
Revision as of 01:34, 10 February 2011
Problem
A power boat and a raft both left dock 
on a river and headed downstream. The raft drifted at the speed of the river current. The power boat maintained a constant speed with respect to the river. The power boat reached dock 
downriver, then immediately turned and traveled back upriver. It eventually met the raft on the river 9 hours after leaving dock 
How many hours did it take the power raft to go from to 
Solution
See also
| 2011 AMC 12A (Problems • Answer Key • Resources) | |
| Preceded by Problem 11 |
Followed by Problem 13 |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
| All AMC 12 Problems and Solutions | |
