2 hours after train A leaves Lucknow a train B leaves the same stationtraveling in the same direction at an average speed of 24 km/hr. After traveling 6 hrsthe train B overtakes the train A. What is the average speed of the train A?  Choose one:
A) 15 km/hr
B) 16 km/hr
C) 17 km/hr
D) 18 km/hr
E) None of these
Explanation :   Total distance covered by B=24*6= 
<gadget id="calculator">24*6</gadget>
<output>144</output>
144kmTotal time taken by A to cover same distance=2+6= 
<gadget id="calculator">2+6</gadget>
<output>8</output>
8 hrsaverage speed of A=144/8= 
<gadget id="calculator">144/8</gadget>
<output>18</output>
18 km/hr   Answer : 18 km/hr
<result>D</result>
2 hours after train A leaves Lucknow a train B leaves the same stationtraveling in the same direction at an average speed of 24 km/hr. After traveling 6 hrsthe train B overtakes the train A. What is the average speed of the train A?