How long does a train 100 m long traveling at 60 kmph takes to cross another train of 170 m in length has a speed of 40 kmph?  Choose the correct option:  A) 1.42 sec  B) 16.8 sec  C) 5 sec  D) 1.68 sec  E) 3.6 sec
D = 100 m   S = (60+40) * 5/18 = 250/3   T = 100 * 9/250= 
<gadget id="calculator">100 * 9/250</gadget>
<output>18/5 = around 3.6</output>
3.6 sec   ANSW3.6 secR:3.6 sec
<result>E</result>
How long does a train 100 m long traveling at 60 kmph takes to cross another train of 170 m in length has a speed of 40 kmph?