A boat moves downstream at the rate of 1 km in \({ \text{7}}\frac{1}{2}\) minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?
8 km/hour
\({ \text{6}}\frac{1}{2}\) km/hour
4 km/hour
\({ \text{3}}\frac{1}{2}\) km/hour
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3
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4
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5
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6
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7
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A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is?
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8
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a man can row 8 km/hr in still water and he find that it takes thrice as long to row upstream as to row downstream to the same point. What is the speed of the current?
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10
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