SOLUTION: A woman jogs for 2 km at 8 km/h and then walks for 2 km at 6 km/h. What is the average speed for the entire trip

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: A woman jogs for 2 km at 8 km/h and then walks for 2 km at 6 km/h. What is the average speed for the entire trip       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 567478: A woman jogs for 2 km at 8 km/h and then walks for 2 km at 6 km/h. What is the average speed for the entire trip
Found 2 solutions by josmiceli, nyc_function:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed is ( total distance ) / ( total time )
+t%5B1%5D+=+2%2F8+
+t%5B1%5D+=+1%2F4+ hr
+t%5B2%5D+=+2%2F6+
+t%5B2%5D+=+1%2F3+ hr
ave speed = +%28+2+%2B+2+%29+%2F+%28+1%2F4+%2B+1%2F3+%29+
+4+%2F+%28+3%2F12+%2B+4%2F12+%29+
+4+%2F+%287%2F12%29+
+%2812%2F7%29%2A4+
+48%2F7+=+6.857+ km/hr
check answer:
ave speed = +%28+2+%2B+2+%29+%2F+%28+1%2F4+%2B+1%2F3+%29+
ave speed = +4+%2F+%28+.25+%2B+.333+%29+
ave speed = +4+%2F+.58333+
ave speed = +6.857+ km/hr



Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Since the distances are equal, average speed is 1/2(8 + 6) = 7km/h