SOLUTION: 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

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Question 181012: 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?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the speed he must go on the return trip.
(10+x)/2=15
10+x=30
x=20 mph
.
Ed