One hour before John started walking from P to Q, a distance of 23 miles, Ann had started walking along the same road from Q to P. Ann walked at a constant speed of 3 miles per hour and John at 2 miles per hour. How many miles had Ann walked when they met?
Answers:
A) 6 miles
B) 8,4 miles
C) 9 miles
D) 9,6 miles
E) 15 miles
Ann walks from Q to P at a speed of 3 miles/hr for one hour. She covers 3 miles in 1 hour and now distance between John and Ann is   23 - 3= 
<gadget id="calculator">  23 - 3</gadget>
<output>20</output>
20 miles.   Ann walks at 3 mph and John at 2 mph so their relative speed is   3+2= 
<gadget id="calculator">  3+2</gadget>
<output>5</output>
5 mph.   They have to cover 20 miles so it will take them  20/5= 
<gadget id="calculator"> 20/5</gadget>
<output>4</output>
4 hours to meet.   In 4 hrs, Ann would have covered 4 hrs * 3 miles per hour= 12 miles.   Adding this to the 3 miles she covered before John, Ann covered a total of 3 + 12= 
<gadget id="calculator">3 + 12</gadget>
<output>15</output>
15 miles.   Answer (15 miles)
<result>E</result>
One hour before John started walking from P to Q, a distance of 23 miles, Ann had started walking along the same road from Q to P. Ann walked at a constant speed of 3 miles per hour and John at 2 miles per hour. How many miles had Ann walked when they met?