A hiker walking at a constant rate of 4 kilometers per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 18 kilometers per hour. The cyclist stops and waits for the hiker 5 minutes after passing her while the hiker continues to walk at her constant rate. How many minutes must the cyclist wait until the hiker catches up?
Choose the correct choice:
A) 7.5	B) 12.5	C) 17.5	D) 22.5	E) 27.5
In 5 minutes, the cyclist travels a distance of   (5/60)*18= 
<gadget id="calculator">  (5/60)*18</gadget>
<output>3/2 = around 1.5</output>
1.5 km.   The time it takes the hiker to complete this distance is 1.5/4 hours= 22.5 minutes   The cyclist needs to wait  22.5 - 5= 
<gadget id="calculator"> 22.5 - 5</gadget>
<output>17.5</output>
17.5 minutes   The answer is 17.5.
<result>C</result>
A hiker walking at a constant rate of 4 kilometers per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 18 kilometers per hour. The cyclist stops and waits for the hiker 5 minutes after passing her while the hiker continues to walk at her constant rate. How many minutes must the cyclist wait until the hiker catches up?