A and B start walking towards each other at 6pm at speed of 4kmph and 6kmph. They were initially 18km apart. At what time do they meet?  Choose the most appropriate option
A) 8pm  B) 6pm  C) 7pm  D) 10pm  E) 5pm
Time of meeting = distance / relative speed = 18/6+3 = 18/9= 
<gadget id="calculator">18/9</gadget>
<output>2</output>
2 hrs after 6pm= 8pm   8pmnswer is 8pm
<result>A</result>
A and B start walking towards each other at 6pm at speed of 4kmph and 6kmph. They were initially 18km apart. At what time do they meet?