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A man jogs at 6 mph over a certain journey and walks over the same route at 4 mph. What is his average speed for the journey?
a) 2.4 mph
b) 4 mph
c) 4.8 mph
d) 5 mph

Read Solution (Total 3)

formula is direct 2xy/x+y so it comes 4.8 where x and y are speeds
9 years agoHelpfull: Yes(0) No(0)

avg speed = 2xy/x+y
where,
x=6,y=4
then
2*6*4/6+4
48/10 = 4.8mph
9 years agoHelpfull: Yes(0) No(0)
Since the distance covered by him is same the average speed of his is determined by using
2ab/(a+b)
2*6*4/(6+4)=4.8
8 years agoHelpfull: Yes(0) No(0)

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