SOLUTION: A man walks at 5kmph for 6hr and at 4km/h for 12hr. His average speed is?

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Question 757506: A man walks at 5kmph for 6hr and at 4km/h for 12hr. His average speed is?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed is always ( total distance traveled ) / ( total time )
+5%2A6+=+30+ km
+4%2A12+-+48+ km
----------------
+6%2B+4+=+10+ hrs
Ave speed = +%28+30+%2B+48+%29+%2F+10+
Ave speed = +78%2F10+
Ave speed is 7.8 km/hr