At 9:00 a.m., Tom begins traveling on a certain bike path from Riverdale at a constant rate of 10 mph. If, at 2:00 p.m., Jim begins traveling from Riverdale on the same path at a constant rate of 20 mph, at what time will he catch up to Peter?  Choices.
A) 4:00 p.m.	B) 5:00 p.m.	C) 6:00 p.m.	D) 7:00 p.m.	E) 8:00 p.m.
My ans: D   By the time Jim starts, Tom has already covered = 5 hr * 10 mph = 50 miles   Relative speed = 20- 10= 
<gadget id="calculator">20- 10</gadget>
<output>10</output>
10mph   To catch up, Jim needs to cover 50 miles which can be covered in= 50/10= 
<gadget id="calculator">50/10</gadget>
<output>5</output>
5 hours   If Jim leaves at 2 pm, he will catch Tom at 7 pm.   Answer: 7:00 p.m.
<result>D</result>
At 9:00 a.m., Tom begins traveling on a certain bike path from Riverdale at a constant rate of 10 mph. If, at 2:00 p.m., Jim begins traveling from Riverdale on the same path at a constant rate of 20 mph, at what time will he catch up to Peter?