In how many seconds will a train 150 meters long pass an oak tree, if the speed of the train is 36 km/hr? Choices: A) 11 B) 13 C) 15 D) 17 E) 19
speed = 36 * 5/18= 
<gadget id="calculator">36 * 5/18</gadget>
<output>10</output>
10 m/s   time= 150/10= 
<gadget id="calculator">150/10</gadget>
<output>15</output>
15 seconds   The answer is 15.
<result>C</result>
In how many seconds will a train 150 meters long pass an oak tree, if the speed of the train is 36 km/hr?