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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 4)

formula used is 2uv/(u+v)
8 years agoHelpfull: Yes(2) No(0)

4.8
(2*6*4)6+4
8 years agoHelpfull: Yes(1) No(0)
2*6*4(4+6) = 4.8
8 years agoHelpfull: Yes(1) No(0)
assume the distance between the two points be 1 mile
then using total distance travelled /total time taken we get
(1+1)/{(1/6)+(1/4)}=4.8 mph
8 years agoHelpfull: Yes(0) No(0)

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