Question 1110187
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For the same distance, the ratio of times is 1.5:1, or 3:2; that means the ratio of speeds is 2:3.<br>
If b is the boat's speed and c is the speed of the current, then the upstream speed is b-c and the downstream speed is b+c.  So<br>
{{{(b-c)/(b+c) = 2/3}}}
{{{3(b-c) = 2(b+c)}}}
{{{3b-3c = 2b+2c}}}
{{{b = 5c}}}
{{{b/c = 5}}}<br>
The ratio of the boat's speed to the speed of the current is 5:1.