A train traveled 580 miles in 2 hours 20 minutes. What was the averge speed of train in miles per hour?  Choose the correct choice from the following choices
A) 270 miles / hour	B) 280 miles / hour	C) 290 miles / hour	D) 300 miles / hour	E) 310 miles / hour
We first convert the time of 2 hours 20 minutes in minutes   2 hours 20 minutes = 2* 60 + 20= 
<gadget id="calculator">2* 60 + 20</gadget>
<output>140</output>
140 minutes   Average speed S is given by distance / time. Hence   S= 580 miles / 140 minutes = 4.83 miles / minute   = 290 miles / hour   correct answer 290 miles / hour
<result>C</result>
A train traveled 580 miles in 2 hours 20 minutes. What was the averge speed of train in miles per hour?