two trains start simultaneously from opposite ends of a 175 - km route and travel toward each other on parallel tracks. train x, traveling at a constant rate, completes the 175 - km trip in 4 hours. train y, travelling at a constant rate, completes the 175 - km trip in 3 hours. how many kilometers had train x traveled when it met train y?
Choose the correct choice from the following answers.
A) 66 B) 69 C) 72 D) 75 E) 78
<gadget id="calculator">175 / 4</gadget>
<output>175/4 = around 43.75</output>

<gadget id="calculator">175 / 3</gadget>
<output>175/3 = around 58.333333</output>

<gadget id="calculator">(175/4) + (175/3)</gadget>
<output>1_225/12 = around 102.083333</output>

<gadget id="calculator">175 / (1_225/12)</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">(175/4) * (12/7)</gadget>
<output>75</output>

<result>D</result>
two trains start simultaneously from opposite ends of a 175 - km route and travel toward each other on parallel tracks. train x, traveling at a constant rate, completes the 175 - km trip in 4 hours. train y, travelling at a constant rate, completes the 175 - km trip in 3 hours. how many kilometers had train x traveled when it met train y?
multiply(divide(175, 4), divide(175, add(divide(175, 4), divide(175, 3))))
if the two trains cover a total distance d , then train x travels ( 3 / 7 ) * d while train y travels ( 4 / 7 ) * d . if the trains travel 175 km to the meeting point , then train x travels ( 3 / 7 ) * 175 = 75 km . the answer is d .