Question 946158

Please help. Juan rides his bike from Lawrence to Salisbury beach (30 miles in 3 hours).  He divides distance (miles) by time (hours) and sees that his overall average speed is 10mph.  He buys 3 Power bars and eats them.  How fast (mph) must he return so that his overall average speed for the round trip (60 miles) is 15mph? 
<pre><font face = "Tohoma" size = 4 color = "indigo"><b>Speed on return trip: {{{highlight_green(30)}}} mph        
You can do the check!! 
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