Lionel left his house and walked towards Walt's house, 48 miles away. Four hours later, Walt left his house and ran towards Lionel's house. If Lionel's speed was 3 miles per hour and Walt's 6 miles per hour, how many miles had Lionel walked when he met Walt? Options: A) 12 B) 16 C) 20 D) 24 E) 28
In the first 4 hours Lionel at the rate of 3 miles per hour covered distance=rate*time=4*3= 
<gadget id="calculator">4*3</gadget>
<output>12</output>
12 miles. So, the distance between him and Walt was 48-12= 
<gadget id="calculator">48-12</gadget>
<output>36</output>
36 miles when Walt left his house. Now, their combined rate to cover this distance was 3+6= 
<gadget id="calculator">3+6</gadget>
<output>9</output>
9 miles per hour, hence they will meet (they will cover that distance) in time=distance/rate=36/9= 
<gadget id="calculator">36/9</gadget>
<output>4</output>
4 hours. Total time that Lionel was walking is 4+4= 
<gadget id="calculator">4+4</gadget>
<output>8</output>
8 hours, which means that he covered in that time interval distance=rate*time=3*8= 
<gadget id="calculator">3*8</gadget>
<output>24</output>
24 miles.   Answer: 24.
<result>D</result>
Lionel left his house and walked towards Walt's house, 48 miles away. Four hours later, Walt left his house and ran towards Lionel's house. If Lionel's speed was 3 miles per hour and Walt's 6 miles per hour, how many miles had Lionel walked when he met Walt?