A person can row a boat d km upstream and the same distance downstream

1.	A person can row a boat d km upstream and the same distance downstream
A.	<table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">hrs</td></tr><tr><td style="text-align: center;">2</td></tr></table>
B.	<table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">hrs</td></tr><tr><td style="text-align: center;">4</td></tr></table>
C.	<table><tr><td rowspan="2">4</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">hrs</td></tr><tr><td style="text-align: center;">4</td></tr></table>
D.	4 hours
Answer» B. <table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">hrs</td></tr><tr><td style="text-align: center;">4</td></tr></table>

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A person can row a boat d km upstream and the same distance downstream

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