Question 1074551

A motorboat traveling with the current went 45 miles in 3 hours. Against the current, it took 4.5 hours to travel the same distance. Find the rate of the boat in calm water. 
<pre>Let speed in calm water be S
Then we get: {{{matrix(1,10,S + C, "=", 45/3, "=====>", S + C, "=", 15, "=====>", eq, "(i)")}}} 
Also, {{{matrix(1,10,S - C, "=", 45/4.5, "=====>", S - C, "=", 10, "=====>", eq, "(ii)")}}} 
2S = 25 ------ Adding eqs (ii) & (i)
S, or speed in calm water = {{{highlight_green(matrix(1,4, 25/2, or, 12.5, mph))}}}
That's how SIMPLE this is......no COMPLEXITIES/CONFUSION!