SOLUTION: Francisco drives to work, which is 23 miles away, at a speed of 40 miles per hour. He drives home from work at a speed of 60 miles per hour. What is Francisco's average speed overa

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Francisco drives to work, which is 23 miles away, at a speed of 40 miles per hour. He drives home from work at a speed of 60 miles per hour. What is Francisco's average speed overa      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


   



Question 870541: Francisco drives to work, which is 23 miles away, at a speed of 40 miles per hour. He drives home from work at a speed of 60 miles per hour. What is Francisco's average speed overall?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed is always ( total distance ) / ( total time )
Total distance = +2%2A23+=+46+ mi
---------------
+t%5B1%5D+=+23+%2F+40+
+t%5B2%5D+=+23+%2F+60+
-----------------------
+t%5B1%5D+%2B+t%5B2%5D+=+23%2F40+%2B+23%2F60+
+t%5B1%5D+%2B+t%5B2%5D+=+23%2A%28+1%2F40+%2B+1%2F60+%29+
+t%5B1%5D+%2B+t%5B2%5D+=+23%2A%28+3%2F120+%2B+2%2F120+%29+
+t%5B1%5D+%2B+t%5B2%5D+=+23%2A%28+5%2F120+%29+ hrs
( total distance ) / ( total time ) = +46+%2F+%28+23%2A%28+1%2F24+%29+%29+
( total distance ) / ( total time ) = +24%2A2+
( total distance ) / ( total time ) = +48+ mi/hr