If Jack walked 8 miles in 1 hour and 15 minutes, what was his rate of walking in miles per hour?	Options:	A) 4	B) 4.5	C) 6	D) 6.4	E) 15
6.4istance walked in 1 hour and 15 mins = 8 miles   Speed per hour = 6.4istance/Time = 8/(5/4)= 
<gadget id="calculator">8/(5/4)</gadget>
<output>32/5 = around 6.4</output>
6.4 miles per hour   Answer 6.4
<result>D</result>
If Jack walked 8 miles in 1 hour and 15 minutes, what was his rate of walking in miles per hour?