two trains leave the train station at the same time. one train, on the blue line, heads east - while the other, on the red line, heads west. if the train on the blue line averages 40 km / hr and the other train averages 40 km / hr - how long will it take for the trains to be 100 km apart?	Choose the correct choice from the following answers:
A) 2 hours	B) 2.25 hours	C) 1 hour	D) 1.25 hours	E) not enough information
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 / 40</gadget>
<output>5/4 = around 1.25</output>

<result>D</result>
two trains leave the train station at the same time. one train, on the blue line, heads east - while the other, on the red line, heads west. if the train on the blue line averages 40 km / hr and the other train averages 40 km / hr - how long will it take for the trains to be 100 km apart?
divide(divide(100, const_2), 40)
each train is averaging 40 km / hour in an opposite direction . after 1 hour , they will be 80 km apart , and after 1.25 hours , they will be 100 km apart . ( 80 * 1.25 = 100 ) answer is d