Two trains leave the same train station at 6:00 am and 6:45 am and they travel at 100 kph and 125 kph respectively. How many kilometers from the train station will the two trains be together?  Choose the correct choice from the following answers:
A) 300
B) 325
C) 350
D) 375
E) 400
At 6:45, the first train is 75 km ahead.   The second train gains 25 km each hour.   The time it takes the second train to catch the first train is 75 / 25= 
<gadget id="calculator">75 / 25</gadget>
<output>3</output>
3 hours.   In this time, the second train travels   3*125= 
<gadget id="calculator">  3*125</gadget>
<output>375</output>
375 km.   The answer is 375.
<result>D</result>
Two trains leave the same train station at 6:00 am and 6:45 am and they travel at 100 kph and 125 kph respectively. How many kilometers from the train station will the two trains be together?