Two cars are 500 cm apart. each is moving forward for 100 cm at a velocity of 50 cm/s and receding back for 50 cm at 25cm/s at what time they will collide with each other.  Choose the correct choice from the following choices
A) 11 sec
B) 14 sec
C) 12 sec
D) 13 sec
E) 15 sec
each car is moving forward for 100 cm with velocity 50cm/s   so time to cover 100cm is=100/50= 
<gadget id="calculator">100/50</gadget>
<output>2</output>
2 sec   again receding back for 50 cm at 25cm/s velocity   so time to cover 50 cm is=50/25= 
<gadget id="calculator">50/25</gadget>
<output>2</output>
2 sec   actually they individually cover  (100-50)= 
<gadget id="calculator"> (100-50)</gadget>
<output>50</output>
50 cm in  (2+2)= 
<gadget id="calculator"> (2+2)</gadget>
<output>4</output>
4 sec   so in 12 sec they together cover  (150+150)= 
<gadget id="calculator"> (150+150)</gadget>
<output>300</output>
300 cm   and after that both move 100 cm in 2 sec   so after  (12+2)= 
<gadget id="calculator"> (12+2)</gadget>
<output>14</output>
14 sec they cover  (300+200)= 
<gadget id="calculator"> (300+200)</gadget>
<output>500</output>
500cm   so they collide after 14 sec   ANSWER:14 sec
<result>B</result>
Two cars are 500 cm apart. each is moving forward for 100 cm at a velocity of 50 cm/s and receding back for 50 cm at 25cm/s at what time they will collide with each other.