A man ran 20 miles in 2 hours 2 minutes. What was the average speed of the man in miles per hour?	Select:	A) 9.72 miles / hour	B) 9.73 miles / hour	C) 9.75 miles / hour	D) 9.78 miles / hour	E) 9.79 miles / hour
We first convert the time of 2 hours 2 minutes in minutes   2 hours 2 minutes = 2* 60 + 2= 
<gadget id="calculator">2* 60 + 2</gadget>
<output>122</output>
122 minutes   Average speed S is given by distance / time. Hence   S= 20 miles / 122 minutes = 0.163mile / minute   = 9.78 miles / hour   correct answer 9.78 miles / hour
<result>D</result>
A man ran 20 miles in 2 hours 2 minutes. What was the average speed of the man in miles per hour?