Both Robert and Alice leave from the same location at 7:00 a.m. driving in the same direction, but in separate cars. Robert drives 30 miles per hour while Alice drives 50 miles per hour. After 6 hours, Alice’s car stops. At what time will Robert’s car reach Alice’s car?  Choose the correct choice from the following options.
A) 1 p.m. B) 3 p.m. C) 4 p.m. D) 7 p.m. E) 9 p.m.
7:00 am so 6 hours later is 1:00 pm   In six hours, Robert will have driven  6*30= 
<gadget id="calculator"> 6*30</gadget>
<output>180</output>
180 miles   In six hours, Alive will have driven 6*50= 
<gadget id="calculator">6*50</gadget>
<output>300</output>
300 miles   So Robert needs  300-180= 
<gadget id="calculator"> 300-180</gadget>
<output>120</output>
120 miles do catch Alice up.   So at 30 mph, he will need 2 hours   1:00 pm + 6 hours= 7:00 pm   ANS : 7 p.m.
<result>D</result>
Both Robert and Alice leave from the same location at 7:00 a.m. driving in the same direction, but in separate cars. Robert drives 30 miles per hour while Alice drives 50 miles per hour. After 6 hours, Alice’s car stops. At what time will Robert’s car reach Alice’s car?