A passenger sitting near the window in a train moving at 40 km/h, noticed that it took 3 sec. for the oncoming train to pass by. What was the speed of the oncoming train if the length of the oncoming train was 69 metres?  Choices:
A) a)50km/h	B) b)42.8km/h	C) c)56km/h	D) d)60km/h	E) e)70km/h
im getting A   3 secs to pass a 75 mts train , therefore speed = 23 meters/sec   to convert m/s to km/hrs multiply by 3.6   23*3.6 = 90   so its  82.8-40= 
<gadget id="calculator"> 82.8-40</gadget>
<output>42.8</output>
42.8 .   b)42.8km/h
<result>B</result>
A passenger sitting near the window in a train moving at 40 km/h, noticed that it took 3 sec. for the oncoming train to pass by. What was the speed of the oncoming train if the length of the oncoming train was 69 metres?